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: While conducting an experiment on gravity, what will be needed to ensure the safety of students?  
 (A) quiet zones (B) drop zones (C) heavy objects (D) frictionless surfaces

Output: B


Input: Consider Input: Genes are located on chromosomes which are composed of  
 (A) DNA. (B) RNA. (C) ATP. (D) ADP.

Output: A


Input: Consider Input: Scientists have studied convergent boundaries and the results of the collisions. Besides the fact that mountains occur at these boundaries, which other part of the rock cycle is most likely associated with these areas of convergence?  
 (A) development of chemical rocks (B) development of extrusive rocks (C) development of layered rocks (D) development of folded rocks


Output: D