You are given a science question (hard-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: Elephants on the African savanna eat shrubs and small trees. This behavior clears land and enables grass to grow. Grazers such as gazelles eat the grass. Lions prey on the gazelles. Which two organisms in this scenario are in the most cooperative relationship?   
 (A) the elephants and the shrubs (B) the shrubs and the lions (C) the elephants and the gazelles (D) the gazelles and the lions

Output: C


Input: Consider Input: Which of these is never found in prokaryotic cells?  
 (A) cell membrane (B) ribosome (C) cell wall (D) nucleus

Output: D


Input: Consider Input: Stout beardfish live in the deep ocean. They live so far down that there is no light. Which characteristic would best help stout beardfish to survive in the dark?  
 (A) a mouth full of bristles (B) a brightly colored body (C) the ability to swim quickly (D) two whiskers that locate food


Output: D