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: The Sun is classified as  
 (A) an organism (B) a decomposer (C) a star (D) a planet

Output: C


Input: Consider Input: Oxygen reacts with iron to produce rust and with hydrogen to produce water. Which statement describes both reactions?  
 (A) A different mixture is formed in each case. (B) A different solution is formed in each case. (C) Both a change of state and of elements is involved. (D) New molecules are formed but the same elements exist.

Output: D


Input: Consider Input: When conducting a scientific experiment in the field, you are expected to  
 (A) completely clear the area. (B) leave the area as you found it. (C) take anything you may need later. (D) destroy specimens once you have observed them.


Output: B