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:
Parents with freckles often have children with freckles. This occurs because  
 (A) freckles develop from light. (B) certain foods cause freckles. (C) certain habits cause freckles. (D) freckles are an inherited trait.

Ex Output:
D


Ex Input:
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

Ex Output:
C


Ex Input:
A student in science class finds an unlabeled bottle containing a liquid. For safety purposes the student should  
 (A) tell the teacher about the bottle and liquid. (B) pour the liquid down the drain. (C) compare the liquid to other liquids. (D) find the mass of the bottle and liquid.

Ex Output:

A