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.

Example Input: Which organ is made mostly of muscle?  
 (A) heart (B) lung (C) ear (D) brain
Example Output: A

Example Input: Which material best conducts heat and electricity?  
 (A) metal (B) plastic (C) rubber (D) wood
Example Output: A

Example Input: Which outcome is most likely if a person consumes more Calories than needed for daily activities?  
 (A) weight loss (B) weight gain (C) deficiency disease (D) infectious disease
Example Output:
B