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I don't know a specific rule (so don't give me lingots ;) ) but If you said "Meine Frau kennt all ('alle' sounds wrong once you add the 'die' - which might just be convention for ease of speaking) die Antworten" you would mean specific answers (e.g. to a set of exam questions you are just talking about). However, I think as you cannot know the context in Duo it is one of those sentences that might be considered correct. Either they simply do not that answer yet, or the idea is that in 90% of cases you would translate the sentence as Duo suggests right now. Sorry I cannot give a better answer, but maybe it helps a little bit
As in my other answer above, I think the speaker in this sentence is speaking broadly, almost like you'd say "God knows all the answers." You wouldn't use wissen in that case because you're not speaking about a specific case but instead speaking rhetorically. This sentence sounds like a guy sitting at the bar griping about his wife being a know-it-all. Not that that's something we ever do. Ever. Especially not if my wife's reading this.
In German, "to know" can be both "kennen" and "wissen". In this sentence they are pretty interchangeable, however, sometimes they have to be distinguished. This will help understanding: http://german.about.com/library/anfang/blanfang16.htm
I mentioned this debate to my mom this morning because she's from Germany and she said that in this case, the way the sentence is phrased, it's a sarcastic "Jesus, my wife thinks she's got all the answers" kind of phrase, instead of a "My wife took that test, and she aced it." In that second case, you'd use wissen.
Why "Frau" is better placed as "Wife in the context of this phrase? Is it because of the usage of "meine"?.
I ask this simply because I have a confusion about "Freund". What's the difference between "Sie ist meine Freundin" and "Sie ist eine Freundin", is the first one referring to a girlfriend?.
Thanks in advance.
As kalukuhan said, he is right. Same thing with Meine... Fruendin: your friend that is a girl; however in German, that's interpreted as girlfriend. There's another way of saying "my friend" (that is a girl) that clarifies the relationship. Useful if you don't want to make things awkward. I don't remember it though.