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: Bivalves feed on plankton and nonliving organic matter., Fact2: Mussels are bivalve mollusks., Question: What do mussels eat? (A) bivalves (B) sub-units of species (C) Something coming from a gland (D) mussels (E) plankton and nonliving organic (F) Something made from fermented ricce (G) mollusks (H) Microscopic organisms
A:
E