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:
One advantage of a hand lens over a microscope is that the hand lens  
 (A) is easier to carry on field investigations. (B) is less likely to be infected by bacteria. (C) makes very tiny objects appear larger. (D) produces a more accurate image.

Ex Output:
A


Ex Input:
A student examines a new watch design. The watch has a small solar cell on its face. The main function of the solar cell is to  
 (A) reduce the cost of the watch. (B) provide an energy source for the watch. (C) make the watch more attractive. (D) stop the watch from speeding up.

Ex Output:
B


Ex Input:
A particular organism is able to survive in an environment due to a thick layer of fat beneath its skin. In which situation would the layer of fat most likely be a survival advantage?  
 (A) swimming in arctic waters (B) eating large amounts of fish (C) being preyed upon by other animals (D) living in an environment with high temperatures

Ex Output:

A