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").

Example Input: Fact1: erosion causes a river to become deeper and wider, Fact2: Weathering and erosion continue to shape it today., Question: Weathering causes what to become deeper and wider? (A) a landslide (B) Sediment (C) a mountain (D) a volcano (E) soils (F) rock (G) flooding (H) a river
Example Output: H

Example Input: Fact1: a plants require water for survival, Fact2: Water contains hydrogen and oxygen., Question: What do plants require for their survival? (A) Light (B) Proteins (C) Energy. (D) salinity (E) hydrogen (F) nutrients (G) sunlight (H) food
Example Output: E

Example Input: Fact1: Insects may live in large colonies and have complex social behaviors., Fact2: Ants are social insects that live in a colony., Question: what have complex behaviors? (A) otters (B) atoms (C) ants (D) Wasps (E) volume (F) h2o (G) Birds (H) cats
Example Output:
C