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: Many things can contribute to the development of a theory. A student made a list of some things that might help scientists develop a theory. Observations Calculations Conversations Publications From the student's list, which must be used in the development of every theory?  
 (A) Observations (B) Conversations (C) Publications and calculations (D) Calculations and conversations

Output: A


Input: Consider Input: Shale is a sedimentary rock that can be metamorphosed into slate by  
 (A) cementation. (B) chemical weathering. (C) sedimentation. (D) increased pressure.

Output: D


Input: Consider Input: A student heats the same amount of two different liquids over Bunsen burners. Each liquid is at room temperature when the student begins. If liquid 1 has a higher specific heat than liquid 2, then liquid 1 will  
 (A) evaporate sooner. (B) take longer to increase in temperature. (C) condense over a longer period. (D) chemically break down at a faster rate.


Output: B