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 item is designed to change electrical energy into heat energy?  
 (A) Alarm clock (B) Hand dryer (C) Fan (D) Telephone

Ex Output:
B


Ex Input:
Which particle type can be identified as being from a specific element?  
 (A) electron (B) atom (C) neutron (D) proton

Ex Output:
B


Ex Input:
Telescopes use lenses to observe distant objects such as stars. Which term best describes what happens when lenses bend and concentrate light?  
 (A) reflecting (B) polarizing (C) diffracting (D) refracting

Ex Output:

D