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.

Ex Input:
Which example would result in new cells that are most different from the parent cells?  
 (A) yeast cells splitting into new cells (B) bacteria cells dividing into new cells (C) skin cells dividing to produce more skin cells (D) sperm and egg cells uniting to produce fertilized egg cells

Ex Output:
D


Ex Input:
Which object is best used to demonstrate the bending of light as it passes through a substance?  
 (A) convex lens (B) flat mirror (C) opaque rod (D) concave mirror

Ex Output:
A


Ex Input:
Which observation of a plant supports the inference that photosynthesis can take place?  
 (A) a strong, sweet smell (B) a dry, rough texture (C) a green color (D) a smooth stem

Ex Output:

C