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: Biodiversity increases the productivity and stability of ecosystems., Fact2: An ecosystem includes the organisms and their habitat., Question: what does biodiversity increase the productivity and stability of? (A) density (B) the looseness of soil (C) water vapor (D) the environment (E) h2o (F) swamp vegetation (G) biological diversity (H) organisms and their habitat
Example Output: H

Example Input: Fact1: hydropower requires damming a river, Fact2: Another source of energy is hydropower., Question: What is a source of energy? (A) fossil fuels (B) cooking (C) damming a river (D) sleeping (E) napping (F) Electrical energy (G) our nearest star (H) sunlight
Example Output: C

Example Input: Fact1: RNA is a small molecule that can squeeze through pores in the nuclear membrane., Fact2: Cells with a nuclear membrane are called eukaryotic ., Question: What is the small molecule that can squeeze through the pores of a eukaryotic cell? (A) RNA (B) corn (C) 17 (D) silk (E) size (F) CPU (G) 100 (H) CIO
Example Output:
A