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").
Input: Fact1: Zooplankton are tiny animals that feed on phytoplankton., Fact2: Many zooplankton are crustaceans., Question: Some crustaceans feed on (A) phytoplankton (B) fungi (C) refraction of light (D) heat energy (E) an organism's body (F) carbon (G) algae (H) salt and water.
Output:
A