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


question:
Which group of organisms can make food by a process called chemosynthesis?  
 (A) scavengers (B) producers (C) consumers (D) decomposers
answer:
B


question:
The speed at which sound waves travel depends on the  
 (A) distance between the vibration source and the receiver. (B) type of material through which the sound travels. (C) size of the object making the sound. (D) type of device making the sound.
answer:

B