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: a delta is formed by deposition of sediment at the mouth of a river by water fanning out, Fact2: Rivers provide a water supply., Question: What is formed by deposition of sediment at the mouth of a water supply fanning out? (A) a hurricane (B) soils (C) a delta (D) an ocean (E) soft soil (F) an island (G) detritus (H) spring

Ex Output:
C


Ex Input:
Fact1: Mammals can also generate little bursts of heat by shivering., Fact2: Polar bears are mammals., Question: What can generate little bursts of heat by shivering? (A) alpacas (B) bacteria (C) animals (D) polar bears (E) phytoplankton (F) rabbit (G) viruses (H) humans

Ex Output:
D


Ex Input:
Fact1: hearing is used for sensing sound by animals, Fact2: Hearing is measured in decibels, which is the degree of loudness required to hear the sound., Question: What can animals sense? (A) a pathogens (B) Temperature (C) hormones (D) decibels (E) mitosis (F) heat (G) erosion (H) decomposition

Ex Output:

D