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: Students are designing kites to discover what type of kite flies the highest. Which is the most important to consider when designing a kite to fly high?  
 (A) string length (B) surface area (C) materials used (D) time of day

Output: B


Input: Consider Input: Black fur is dominant to white fur in guinea pigs. If two black guinea pigs (Bb) are crossed, what color will the fur of their offspring be?  
 (A) 100% black (B) 100% white (C) 50% black, 50% white (D) 75% black, 25% white


Output: D