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: Similar types of cells form tissues. What is the next level of complexity formed from the grouping of tissues?  
 (A) organs (B) organelles (C) organisms (D) organ systems

Output: A


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

Output: B


Input: Consider Input: A chemist observed bubbling and fizzing after adding an acid solution to a white powdery substance in a beaker. Which of the following can be inferred?  
 (A) The acid boiled when poured into the beaker. (B) The acid and powder formed a new product. (C) A physical reaction produced a gas mixture. (D) A reaction occurred that produced heat.


Output: B