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 part of an atom is involved in chemical reactions?  
 (A) nucleus and its particles (B) negatively-charged particles (C) neutrally-charged particles (D) positively-charged particles

Ex Output:
B


Ex Input:
Which of these would help to prevent infections from occurring in small cuts and scrapes?  
 (A) apply a cold ice pack (B) raise the injured area (C) apply pressure to stop bleeding (D) wash the area with warm, soapy water

Ex Output:
D


Ex Input:
What ALWAYS happens when the nucleotides in a strand of DNA is rearranged?  
 (A) The information on the strand changes. (B) The mass of the strand changes. (C) The organism dies. (D) The organism thrives.

Ex Output:

A