Rhetoricians differ subtly over how the unspoken question should be represented. One approach regards the first clause as prompting a question through its meaning. Another explains the discourse in question-and-answer terms while resisting the claim that the first clause is literally a question in wording.
Both approaches recognize the rhetorical link between a tacit inquiry and an expressed response. The nuance concerns the location and status of that implied inquiry. Accurate teaching should not confuse a reconstructed discourse question with an overt interrogative clause.