Definition: 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: seed dispersal has a positive impact on a plant, Fact2: Plants are the foundation of the ecosystem's food chain., Question: What usually has a positive impact on an ecosystem's food chain? (A) Jellyfish (B) mussels (C) invasive seeds (D) genetic diversity (E) seed dispersal (F) colony collapse (G) peachleaf willow (H) blossom end rot
Output:
E