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: Sponges have specialized cells called collar cells., Fact2: Flagellum of collar cell cause current to pass over collar and food is collected., Question: Which aspect of a sponge's cells allow it to collect food? (A) the cervix (B) teeth (C) flagellum (D) cartilage (E) plasma (F) osculum (G) tissue (H) potassium

Ex Output:
C


Ex Input:
Fact1: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Water is a mechanical weathering force., Question: What  weathers rocks? (A) soil (B) streams (C) a delta (D) calcite (E) erosion (F) water (G) grass (H) the sun

Ex Output:
F


Ex Input:
Fact1: a cactus stem is used for storing water, Fact2: Other animals eat cactus to get water., Question: Why do animals eat stems? (A) Animal survival (B) A transportation fuel (C) it keeps an organism warm (D) It gets more light (E) basic building blocks of life (F) Plants store liquids there (G) it needs them (H) Help plants grow

Ex Output:

F