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: Which of these is an example of water changing from water vapor to liquid?  
 (A) moisture forming on a mirror when you breathe on it (B) sweat forming on your body when you exercise (C) ice cubes melting when you put them in a warm liquid (D) rivers drying up during a very hot summer

Output: A


Input: Consider Input: A tropical rain forest contains many tall trees. Smaller plants with large leaves grow at the base of the tall trees. The large leaves are most likely an adaptation of the plant due to which condition?  
 (A) lack of sunlight (B) lack of oxygen (C) lack of water (D) lack of food

Output: A


Input: Consider Input: Mr. Jenkins constructed a circuit consisting of a variable source, wires, and a resistor. In order to triple the amount of current, how should he change the voltage of the source?  
 (A) make the voltage three times larger (B) make the voltage one-third as great (C) make the voltage nine times larger (D) make the voltage one-ninth as great


Output: A