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:
The basic life functions of an organism are carried on by  
 (A) cells (B) nutrients (C) atoms (D) hormones

Ex Output:
A


Ex 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.

Ex Output:
C


Ex Input:
All plants and animals have mechanisms that  
 (A) transport nutrients (B) perform photosynthesis (C) regulate nerves (D) produce flowers

Ex Output:

A