TASK DEFINITION: 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.
PROBLEM: Which unit is used to express the amount of energy in food?  
 (A) Calorie (B) degree Celsius (C) milliliter (D) gram

SOLUTION: A

PROBLEM: A student has just completed a laboratory activity. What is the last action that the student should perform before leaving the lab area?  
 (A) wash hands (B) turn off all equipment (C) put away all glassware (D) wash instruments and table tops

SOLUTION: A

PROBLEM: In which ways are hills most different from mountains?  
 (A) Hills are smaller and more rounded. (B) Hills are deeper and more level. (C) Hills are steeper and rockier. (D) Hills are taller and snowy.

SOLUTION:
A