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: DNA technology has improved greatly in the last twenty years. Which task has been made easier by the development of DNA technology?  
 (A) identifying genetic disorders (B) determining the parts of an atom (C) observing distant objects in space (D) making very accurate measurements

Output: A


Input: Consider Input: Which characteristic of sound makes it possible for bats to fly in the dark without hitting any objects?  
 (A) refraction (B) reflection (C) conduction (D) amplification

Output: B


Input: Consider Input: To safely conduct an experiment using chemicals, what should students always do?  
 (A) Work in large groups. (B) Wear safety goggles. (C) Wear short sleeves. (D) Keep a window open.


Output: B