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: wind and rain cause erosion, Fact2: Water, in the form of rain, is the most effective agent of erosion., Question: What causes erosion the most? (A) streams (B) motion (C) LEDs (D) water (E) Roads (F) rivers (G) Winter (H) wind
Example Output: D

Example Input: Fact1: RNA is a small molecule that can squeeze through pores in the nuclear membrane., Fact2: Like proteins, DNA and RNA are polymers of various small chemically related molecules., Question: polymers of various small chemically related molecules can squeeze through pores in the what? (A) protein channel (B) transportation (C) nuclear membrane (D) interior chambers (E) nucleus (F) dermal & vascular tissue (G) cell division (H) Microscopic vessels.
Example Output: C

Example Input: Fact1: igneous rocks are formed from magma cooling, Fact2: Igneous rocks crystallize from magma from mantle., Question: Where does the lava come from that makes igneous rocks? (A) Mantle (B) tube (C) Core (D) Mountains (E) Crust (F) heat (G) Earth (H) cracking
Example Output:
A