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: Secondary meristem is located within and around the vascular tissues., Fact2: Plant tissues are produced from meristems., Question: What has vascular tissue? (A) rocks (B) the Sun (C) trees (D) plants (E) grass (F) Conifers (G) all plankton (H) Oak
Example Output: D

Example Input: Fact1: Evolution occurs in response to a change in the environment., Fact2: Extinction is a natural part or the process of evolution., Question: What happens to an environment to cause extinction?  (A) relocation (B) changes (C) rain (D) exposure (E) forces (F) wind (G) Pollution (H) discovery
Example Output: B

Example Input: Fact1: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Sediment, and sedimentary rock, is made of particles broken down from other rocks., Question: Mechanical weathering produces (A) Sand dollars (B) calcite (C) homogenous (D) Sediment (E) soft soil (F) rainfall (G) cactuses (H) movement
Example Output:
D