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.
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Question: During a biochemical reaction, pyruvate (C3H4O3) is converted into carbon dioxide (CO2) and water (H2O). In what cellular organelle does this biochemical reaction occur?  
 (A) nucleus (B) cytoplasm (C) mitochondria (D) endoplasmic reticulum

Answer: C


Question: What is a decomposer?  
 (A) a living thing that breaks down dead organisms (B) a living thing that makes its own food (C) an animal that eats live plants (D) an animal that hunts other animals

Answer: A


Question: Anne and her father find a 30-million year-old tropical plant fossil in Louisiana. Which question does the fossil help them answer?  
 (A) Were there mountains in Louisiana 30 million years ago? (B) What was the climate like in Louisiana 30 million years ago? (C) Were there earthquakes in Louisiana 30 million years ago? (D) What kind of animals lived in Louisiana 30 million years ago?

Answer:
B