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: fog is formed by water vapor condensing in the air, Fact2: Water vapor rises into the atmosphere., Question: what does the atmosphere do before turning into fog (A) adapt (B) rest (C) Rise (D) fall (E) cooled (F) snow (G) swirl (H) Lift
Example Output: C

Example Input: Fact1: matter vibrating can cause sound, Fact2: Thus, sound is a wave in air ., Question: what can matter vibrating cause? (A) Pollution (B) energy (C) Relieve pain (D) kinetic energy (E) wave in air (F) Energy. (G) murmur (H) Greenhouse gases
Example Output: E

Example Input: Fact1: fossils are formed when layers of sediment cover the remains of organisms over time, Fact2: All streams carry sediment ., Question: What carries something that covers organisms to make fossils? (A) squids (B) Streams (C) streams. (D) coral reef (E) coral (F) amoebae (G) bamboo (H) Nematoda
Example Output:
B