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: Consider 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

Output: C

Input: Consider Input: Fact1: Some parasites kill their host, but most do not., Fact2: Parasites include lungworms and GI parasites., Question: What can kill their host? (A) cigarettes (B) bacteria (C) adding heat (D) heat or cold (E) burning (F) Dehydration (G) lungworms (H) Pollution

Output: G

Input: Consider Input: Fact1: volcanic ash in the atmosphere decreases the temperature by blocking the sun, Fact2: Small temperature variations can have major effects on natural ecosystems., Question: What can volcanic ash in the atmosphere do to natural ecosystems? (A) Create wealth (B) negative feedback (C) rapid changes occur (D) Major effects (E) erosion (F) No effect (G) Forest fire (H) Start engines
Output: D