A rhetorical answer is the instance where an answer is given to an unasked question but it is anticipated to be thought of by the majority of those involve in the conversation.
Bob: I have no idea what I should do for my birthday
Gilly: Party sounds good!
Tom: MANSION PARTY!!!
Theodore: China Town - and *no, I don't care to elaborate*.
Theodore has given an example of a rhetorical answer (highlighted by two asterix).