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: A student is trying to identify a mineral that has a nonmetallic luster and is black. It can also be scratched with a fingernail. According to the mineral reference sheet, the unidentified mineral is most likely  
 (A) mica. (B) magnetite. (C) hornblende. (D) quartz.

Output: A


Input: Consider Input: What characteristic of DNA results in cell differentiation in developing embryos?  
 (A) which genes are present (B) how many copies of each gene are present (C) which genes are active (D) what protein is produced by a gene

Output: C


Input: Consider Input: A sound is heard when you pluck a string on a guitar. What will happen to the sound if the same string is plucked harder?  
 (A) The volume will stay the same, and the pitch will be higher. (B) The pitch will stay the same, and the volume will be higher. (C) Both the pitch and the volume will be higher. (D) Both the pitch and the volume will stay the same.


Output: B