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: When oxygen combines with hydrogen, which substance is formed?  
 (A) water (B) vinegar (C) hydrochloric acid (D) hydrogen dioxide

Output: A


Input: Consider Input: A student is designing a model of the solar system and writing a report. She is trying to be as accurate as possible. Which statement should she include in her report?  
 (A) The distance between the Sun and Earth is measured in light years. (B) Jupiter and Uranus are considered to be terrestrial planets. (C) The asteroid belt is located between Jupiter and Saturn. (D) The orbit of Mars is similar to the orbit of Saturn.

Output: D


Input: Consider Input: A seed of a plant sticks to the fur of an animal as it walks by. How has the animal most likely helped the plant?  
 (A) by spreading the seed (B) by sprouting the plant (C) by scattering the pollen (D) by fertilizing the ground


Output: A