Sorry to bring up an old discussion, but I just thought of two phrases: Yep and Nope
It also occurred to me…to differentiate between your WC piston asking a question and Alexa asking a question, you might want to preface any WC questions with question, choice, or decision.
"Decision. Would you like to turn off the TV?"…“Yep”
"Question. Did you take your medication yet?"…“Nope”
[EDIT] Oops…I see Khaled had the same idea for responses. Darn it!