instruction:
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.
question:
Which adaptation helps a bird fly?  
 (A) larger feet (B) bigger eyes (C) longer beaks (D) hollow bones
answer:
D


question:
Which plant is grown for food?  
 (A) Rice (B) Tobacco (C) Orchid (D) Cotton
answer:
A


question:
Which sense can be used to determine an object's ability to reflect light?  
 (A) sight (B) hearing (C) smell (D) taste
answer:

A