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: A student is shown a slide of cells from a species of producer in a food web. The student observes that the cells have chloroplasts. What conclusion about the food web is best supported by these findings?  
 (A) The producers capture energy from sunlight. (B) The food web is found in a terrestrial ecosystem. (C) The producers in the web are single-celled organisms. (D) The food web contains many herbivores and omnivores.

Output: A


Input: Consider Input: After a soccer game, Brittany sat under a fan because she was hot. Under the fan, she felt cooler than before. Which explains why Brittany felt cooler under the fan?  
 (A) Air moving under the fan is cooler than air that is still. (B) The evaporation of sweat absorbs heat from the skin. (C) Water vapor from the fan condenses on the skin. (D) The fan speeds convection currents in the air.

Output: B


Input: Consider Input: Which is the best unit to measure distances between Earth and other solar systems in the universe?  
 (A) miles (B) kilometers (C) light years (D) astronomical units


Output: C