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:
Which animal eats only plants?  
 (A) Cat (B) Dog (C) Lion (D) Rabbit

Ex Output:
D


Ex Input:
What property is the same for each atom of an element?  
 (A) energy (B) mass number (C) atomic number (D) number of neutrons

Ex Output:
C


Ex Input:
DNA stores the genetic instructions transferred from one generation to the next. What is DNA?  
 (A) a molecule (B) a membrane (C) a cell nucleus (D) a spiral-shaped cell

Ex Output:

A