Detailed Instructions: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Q: Fact1: Mollusks are a major food source for other organisms, including humans., Fact2: Interestingly, a squid is also a mollusk., Question: What is a food source for humans? (A) trees (B) sugar (C) carbon dioxide (D) squid (E) rocks (F) plants (G) dirt (H) animals
A:
D