..which has a different meaning in German. If a German is in a dutch clothing store in the changing cabin and the employee asks if they need help it's important for the German to know that "ik kom klaar" does NOT mean the same thing as the German "ich komm klar" (=I'm fine) :D
You're going the wrong way, but otherwise you're right:
The infinitive is "komen". If the verb would be regular, the plural would be "komen", which it is, while the singulars would be based on "koom", which they aren't. Instead, the singulars are based on "kom": "ik kom", "jij komt", "hij komt". As a strong verb, the plural would be "kwamen", which it is, but again the singular is not "kwaam", but instead is "kwam". Finally, the past particible is "gekomen", just like it would be for a strong verb.
So, the spelling of the word is not about how the rules would suggest it is, but about how the words are actually used. (Spelling does have some rather curious issues, but that's a different story.) Why doesn't "komen" get a double "m"? Because the verb really is "komen", rather than "kommen"? Why doesn't "komt" get two "o"-s? Because the singular really is based on "kom". "Komen" is an irregular verb: a verb that does not exactly follow either of the two conjugation-patterns recognised in Dutch.
How is it an idiot question? The way I understand the situation (corrections welcome) is this: the infinitive form 'komen' only contains one 'm', so the 'o' is at the end of a syllable and therefore long. This would normally mean that it is also long in the remaining verb forms. To keep the long 'o', Dutch pronunciation rules would require the spellings 'ik koom', 'jij koomt' and 'hij/zij/het koomt'. In fact, however, these forms are not used. Quote from Wikipedia (https://en.wikipedia.org/wiki/Dutch_conjugation): The verb komen has an irregular pattern with short o in the present singular, long oo* in the remaining present tense, and an additional w in the past: kom/komen, kwam/kwamen, gekomen ("to come").
*This refers to the pronunciation, not the spelling. letsrockltd
So yes, it is an exception. And there is nothing idiotic about the question.
Does this also mean in Dutch what it figuratively means in English ?
You could say ‘de echtgenoten komen’ (‘de echtgenoot’ = ‘the husband’; ‘de echtgenote’ = the wife; plural of both: ‘echtgenoten’). I suspect that, much as in German, ‘man’ and ‘vrouw’ only mean ‘husband’ and ‘wife’ when used in conjunction with possessive pronouns (‘mijn man’ = ‘my husband’) or when otherwise heavily implied by context.
There's no automatic simple present in Duolingo. Though such would probably be preferable for any course starting from English, the contributors instead have to add those manually. Obviously, they could use just the simple present instead, but then there would be plenty of pupils who forget that the English is just the helper language here. So, either way, a present tense requires adding an extra answer. That's a lot of extra answers; obviously they'll occasionally miss one. When you find one, report that your answer should be accepted as well, and soon you'll see that you answer becomes accepted as well.