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:
During which process does a caterpillar become a butterfly?  
 (A) fertilization (B) metamorphosis (C) asexual reproduction (D) biological adaptation
answer:
B


question:
A meeting of scientists, called a symposium, occurs every year to share recent research about the atmosphere of Earth. This symposium mainly serves which purpose in science?  
 (A) to test research methods used by other scientists (B) to develop questions about space research (C) to discuss the meaning of new discoveries (D) to explain gas properties to the general public
answer:
C


question:
During a space mission, scientists will send experiments for the astronauts to conduct in space. In many cases, scientists have made predictions about the outcome of the experiment. Why do astronauts perform the experiment if the results have already been predicted?  
 (A) to obtain data to test a hypothesis (B) to make a complete observation (C) to make a report of the procedures (D) to make a hypothesis understandable
answer:

A