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 is an example of a form of electrical energy?  
 (A) lightning (B) windmill (C) radio waves (D) sound waves

Ex Output:
A


Ex Input:
Which material is most easily recycled at school?  
 (A) plastic wrap (B) notebook paper (C) ice cream sticks (D) rubber erasers

Ex Output:
B


Ex Input:
A recent scientific study funded by a medical corporation concluded that its product is not as harmful as consumers have reported. Identify a possible problem with this study.  
 (A) Corporate scientists have less training than other scientists. (B) The results of the study may be influenced by bias. (C) Privately funded science is not verified by other scientists. (D) The study cannot be repeated with the same results.

Ex Output:

B