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:
Sickle cell anemia is a genetic disease caused by an autosomal recessive gene. If each parent carries one sickle cell allele, what are the chances that their child will have sickle cell anemia?  
 (A) no chance (B) one in four (C) two in four (D) three in four

Ex Output:
B


Ex Input:
Which plant is grown for food?  
 (A) Rice (B) Tobacco (C) Orchid (D) Cotton

Ex Output:
A


Ex Input:
The complex, three-dimensional structure of a protein is sensitive to heat because the structure is maintained by  
 (A) hydrogen bonds. (B) covalent bonds. (C) Brownian motion. (D) magnetic fields.

Ex Output:

A