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: Cells are the microscopic building blocks of organisms., Fact2: Plants and animals are organisms., Question: What are cells in plants and animals? (A) production of energy (B) absorb light energy (C) large building blocks (D) sub-units of species (E) cellulitis (F) microscopic bulding blocks (G) disease (H) microorganisms
Example Output: F

Example Input: Fact1: Differentiation is the process by which unspecialized cells become specialized., Fact2: T helper cells differentiate to Memory cells and effector cells., Question: memory cells and effector cells are what compared to T helper cells (A) dermal & vascular tissue (B) antibodies (C) fetal development (D) antigens (E) occurs over a wide range (F) prokaryotic cells (G) unicellular organisms (H) more specialized
Example Output: H

Example Input: Fact1: contact between rocks over long periods of time causes rocks to smooth, Fact2: Primary rock types are Sandstone, and Shale., Question: what smooths over long periods of time due to contact? (A) oxygen (B) calcite (C) h2o (D) clouds (E) erosion (F) shale (G) bamboo (H) rivers
Example Output:
F