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 object works best when reflecting light?  
 (A) mirror (B) camera (C) binoculars (D) eyeglasses

SOLUTION: A

PROBLEM: 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

SOLUTION: A

PROBLEM: Gel electrophoresis is a technology which allows researchers to reliably separate and sort DNA fragments. This technology is most useful for which application?  
 (A) selective breeding (B) medical gene repair (C) genetic engineering (D) cell metabolism analysis

SOLUTION:
C