I thought this sentence would be "The lemon is a sour food." (instead of: "Lemons are...") Wouldn't it be "I limoni sono un cibo acido"?

How can "lemons are" be a correct option? The verb, the noun, and the article are all singular. Can someone explain?

It doesnt give me the option of lemon! Of course i'll be wrong!

I translated to "lemons are an acidic food" - should be accepted, no?

There was not an option to select the word "lemon" so lemons shouldbe accepted or else the sentence to translate is incorrect.

"A food"? I thought food was uncountable in English...?

"Lemons are..." is accepted (I don't know if it was before), but it doesn't match the sentence.

I think that "lemons are a sour food" is accepted as well as "the lemon is a sour food" because that it is talking about lemons/food in general. Of course, "il limone è" is singular, so it would have to be "i limoni sono", but I think it's just making a generalization that yes, lemons are a sour food, and yes, the lemon is a sour food, basically making it the same thing.