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: when a metal rusts , that metal becomes orange on the surface, Fact2: Cast-iron and steel surfaces are susceptible to corrosion in the form of rust., Question: Cast-iron and steel surfaces are susceptible to becoming what on the surface? (A) hardness (B) solid (C) irritants (D) acids (E) orange (F) heat (G) Unsafe (H) damaging

Ex Output:
E

Ex Input:
Fact1: Corals form large colonies in shallow tropical water., Fact2: Corals are tiny flower-like animals that live in colonies., Question: Where do flower-like animals live? (A) Hot waters (B) Cold waters (C) Chlorophyll (D) loose soil (E) Shallow waters (F) our planet (G) the environment (H) Deep waters

Ex Output:
E

Ex Input:
Fact1: Cells are the basic units of the structure and function of living things., Fact2: Osteogenic cell types are indicated., Question: What is a type of the basic units of the structure and function of living things? (A) sensory neurons (B) osteogenic (C) animals (D) Chemical energy (E) Energy (F) trees (G) ferns (H) fur and fat

Ex Output:
B