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 battery converts chemical energy into electrical energy, Fact2: Electrical energy can be converted into kinetic energy and heat energy by an electric motor., Question: What can convert chemical energy into kinetic energy (A) a magnet (B) a vacuum (C) a windmill (D) a battery (E) arteries (F) barnacles (G) animals (H) engines

Ex Output:
D


Ex Input:
Fact1: Streams may start with runoff or water seeping out of a spring., Fact2: Streams A stream is a sequence of characters., Question: a sequence of characters may start with runoff or what seeping out of a spring? (A) sodium (B) Joules (C) liquid (D) rivers (E) solutes (F) water (G) rain (H) SO2

Ex Output:
F


Ex Input:
Fact1: plucking a string can cause that string to vibrate, Fact2: When the strings on a guitar vibrate, they transmit their vibrations to the saddle., Question: What vibrates the saddle? (A) voltage (B) friction (C) nerves (D) heat energy (E) mechanical (F) plucking (G) energy (H) waves

Ex Output:

F