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: Genes are located on chromosomes which are composed of  
 (A) DNA. (B) RNA. (C) ATP. (D) ADP.

Output: A


Input: Consider Input: In humans, B is the allele for brown eyes and b is the allele for blue eyes. Two brothers both have brown eyes, but one of them has both the B and b alleles while the other only has B alleles. Which statement is true about the brothers?  
 (A) They have the same genotype and phenotype. (B) They have different phenotypes and genotypes. (C) They have the same phenotype but different genotypes. (D) They have the same genotype but different phenotypes.

Output: C


Input: Consider Input: When stratospheric ozone levels are reduced, the amount of ultraviolet radiation hitting Earth increases. Ozone depletion is most often caused  
 (A) by the reversal of the magnetic field of Earth. (B) when fluorocarbons are released into the atmosphere. (C) when electromagnetic waves from the Sun increase. (D) by abrupt changes in weather and climate patterns.


Output: B