What's the policy on answering a question where the correct answer is simply “yes”?

Occasionally I see questions on math.SE where either the answer is completely trivial -- for example this one where the correct answer would just be "Yes. You did it correctly" -- or questions where a few questions/responses from people in the comments is enough to answer the question for the OP. Either way an answer just seems to be overkill.

What is the policy with these types of questions?

My $\$0.02\$: I can't see most of the questions of these types being helpful to anyone, thus I would think that they should be closed. But none of the closure reasons seem to fit. Perhaps we could make a new one?

• If none of closure reasons fit, you can make a new one. – user147263 May 23 '15 at 2:23
• This meta question asks basically the same thing, and has (in my opinion) a very good answer. I recall other times this has come up on meta, though I can't find them. – Milo Brandt May 23 '15 at 3:22
• @Meelo I think you can find most of posts discussing this when you browse (solution-verification) tag here on meta. (Which is, of course, different from the (solution-verification) tag on the main site, although they share the same name.) – Martin Sleziak May 23 '15 at 5:15