You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

Ex Input:
Four students tried to find out which magnet was the strongest. They each shared one idea. Which idea shows scientific thinking?  
 (A) We can pick the longest magnet. (B) We can pick the heaviest magnet. (C) We can measure the strength of the magnets. (D) We can vote for the magnet that we think is the strongest.

Ex Output:
C


Ex Input:
Bones support the body. What pulls and pushes on bones to move them?  
 (A) blood (B) nerves (C) muscles (D) skin

Ex Output:
C


Ex Input:
Specialized cells protect the human body from disease-causing microbes by  
 (A) producing chemicals that destroy the microbes (B) dissolving wastes from the microbes (C) creating recessive genes in the microbes (D) supplying oxygen and nutrients to the microbes

Ex Output:

A