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: Air pollution harms the respiratory and circulatory systems., Fact2: Cars are a significant source of air pollution., Question: What harms the respiratory and circulatory systems? (A) oil (B) rain (C) sulfur (D) cars (E) tires (F) coal (G) tar (H) bicycles

Output: D


Input: Consider Input: Fact1: if soil is permeable then water easily flows through that soil, Fact2: Sandy soils are permeable., Question: Water easily flows through what? (A) streams. (B) streams (C) coral reefs (D) sandy soils (E) aqueous solution (F) swamp vegetation (G) calcite (H) Sediment

Output: D


Input: Consider Input: Fact1: chemical weathering causes iron in rock to oxidize, Fact2: Fe is the periodic symbol for Iron., Question: Chemical weathering causes what in rock to oxidize? (A) Fe (B) tar (C) h2o (D) H20 (E) DDT (F) Ag (G) O (H) CO2


Output: A