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: a delta is formed by deposition of sediment at the mouth of a river by water fanning out, Fact2: Rivers provide a water supply., Question: What is formed by deposition of sediment at the mouth of a water supply fanning out? (A) a hurricane (B) soils (C) a delta (D) an ocean (E) soft soil (F) an island (G) detritus (H) spring
Example Output: C

Example Input: Fact1: Roundworms may be free-living or parasitic., Fact2: Roundworms make up the roundworm phylum, Nematoda., Question: What can the phylum Nematoda be? (A) dangerous (B) parasitic (C) horses (D) meiosis (E) more abundant (F) graptolites (G) homogenous (H) phytoplankton
Example Output: B

Example Input: Fact1: ice wedging is when ice causes rocks to crack by expanding in openings, Fact2: Water in the cracks of rocks freeze and expand., Question: Ice wedging is when water  (A) coldest season (B) Metling snow (C) freezes and contracts (D) freezes and melts (E) mouth of rivers (F) In the winter (G) freezes and condenses (H) freezes and expands
Example Output:
H