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: 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

Output: B


Input: Consider Input: Which set contains kingdoms that contain only heterotrophs?   
 (A) Protists, Fungi (B) Bacteria, Animals (C) Plants, Fungi (D) Animals, Fungi

Output: D


Input: Consider Input: Wolves kill many elk every year and often attack old, sick, and injured members of a herd. Which of the following best describes the role of the wolves in the wolf-elk relationship?  
 (A) competitor (B) host (C) parasite (D) predator


Output: D