Teacher: Given the prompt and a response, classify the them to "yes" if response is "yes, and" type. Otherwise classify it as "no". "Yes, and" is a rule-of-thumb in improvisational comedy that suggests that a participant in a dialogue should accept what another participant has stated ("Yes") and then expand on that line of thought or context ("and..."). 1 In short, a "Yes, and" is a dialogue exchange in which a speaker responds by adding new information on top of the information/setting that was constructed by another speaker. Note that a "Yes, and" does not require someone explicitly saying 'yes, and...' as part of a dialogue exchange, although it could be the case if it agrees with the description above. There are many ways in which a response could implicitly/explicitly agree to the prompt without specifically saying 'yes, and...'. 
Teacher: Now, understand the problem? If you are still confused, see the following example:
Prompt: I'm glad you came into my office today, young man. Look around you. Everything that's in here, I purchased. 
 Response: Wow! You own everything in this office?
Solution: yes
Reason: This is correct answer because response is in support with the prompt and extends the context from prompt.

Now, solve this instance: Prompt: Listen, normally I just like small groups of people, like three. But I've learned in my heart that sometimes there's bigger groups of people around and I've got to get with the times. So, Alexandro, will you marry me? 
 Response: Lisa, as much as I don't like to talk about myself, you asked me a question. And the answer to that question is yes. Yes, I will marry you, Lisa.
Student:
yes