"Are you smart? Yes. I am smart."
Translation:bIval'a'? HISlaH. jIval.
There seems to be an error with this question (and the other very similar one) where if I type " Suval'a'? HISlaH. jIval. " it says it's incorrect when in reality bIval'a' and Suval'a' are both correct. The other question is reversed: submitting bIval'a' instead is marked incorrect.
The Su- prefix indicates that the original question is being addressed to multiple people. So the answer should come from multiple people. Since the English indicates that only one person is answering, this exercises requires you to assume that the question is being asked only of one person, thus the prefix must be bI-.
I'm not sure what other question you are talking about, but if it is similar and uses "we" in the response, then for the same reasons, the singular bI- will not be accepted.