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").

Ex Input:
Fact1: Cells are the basic units of the structure and function of living things., Fact2: Tigers are the largest of the living cats., Question: Cells are the basic units of the structure and function of what? (A) water (B) mammals (C) ice (D) tigers (E) animals (F) humans (G) plants (H) the Sun

Ex Output:
D


Ex Input:
Fact1: breaking apart rocks can cause debris, Fact2: Examples of such rock include sandstone and shale ., Question: What can cause debris? (A) breaking apart sandstone (B) some invertebrates (C) breaking apart air (D) remains of prehistoric life (E) exposure to cold (F) breaking apart clouds (G) breaking apart water (H) forest is destroyed

Ex Output:
A


Ex Input:
Fact1: creating paper requires cutting down trees, Fact2: Trees only grow to be cut down., Question: What needs to grow for paper to be made? (A) paper (B) books (C) trees (D) birds (E) grass (F) flowers (G) fibers (H) plants

Ex Output:

C