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: Which property of air does a barometer measure?  
 (A) speed (B) pressure (C) humidity (D) temperature

Output: B


Input: Consider Input: A light year is used to measure  
 (A) time. (B) distance. (C) luminosity. (D) temperature.

Output: B


Input: Consider Input: Aerogels are compounds formed by the drying of certain gels. Although the aerogel hardens into a solid material, the particles in the gel are much farther apart than those of most solids and particles are held together by strong bridges of covalently bonded atoms. Which of the following is a likely property of aerogels?  
 (A) very low density (B) high electrical conductivity (C) very low melting point (D) very flexible


Output: A