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: Some people carry a mutated allele of a particular gene that makes them resistant to HIV infection and AIDS. Which best describes this type of mutation?  
 (A) beneficial (B) asexual (C) harmful (D) unicellular

Output: A


Input: Consider Input: Animals get energy for growth and repair from  
 (A) soil (B) food (C) water (D) air

Output: B


Input: Consider Input: Which process is an example of a physical change?  
 (A) wood burning (B) iron rusting (C) ice melting (D) milk souring


Output: C