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.

Input: Consider Input: Which object works best when reflecting light?  
 (A) mirror (B) camera (C) binoculars (D) eyeglasses

Output: A


Input: Consider Input: What form of energy is being used when a person pushes a wooden block across the floor?  
 (A) mechanical (B) magnetic (C) sound (D) electrical

Output: A


Input: Consider Input: Which of the following statements best describes a complex machine?  
 (A) It is designed to move with a motor. (B) It is constructed from machine-made parts. (C) It is made of more than one simple machine. (D) It is built from more than one type of material.


Output: C