Instructions: 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: People use many tools to help measure changes. Which person is measuring a change?  
 (A) A sports player scores a goal. (B) A scientist gives a weather report. (C) A friend watches a television show. (D) A nurse checks the temperature of a patient.
Output:
D