Choose the correct answer

Peter: Nam, can you help me with my school project? I need to interview some people about what they like to eat and drink.

Nam: Sure. What questions do you have?

Peter: What's your favorite food, Nam?

Nam: It's spring rolls.

Peter: What's your favourite drink?

Nam: I like lemonade.

Peter: Interesting. What foreign food do you like?

Nam: Mmm, I like apple pie and pancakes.

Peter: How about new food? Is there anything that you've never had, but would like to try?

Nam: Certainly. I'd love to try Hu Tieu in Ho Chi Minh City.

Question:   What is Nam's favorite drink?