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:
The basic life functions of an organism are carried on by  
 (A) cells (B) nutrients (C) atoms (D) hormones

Ex Output:
A


Ex Input:
A biological community is made up of all the  
 (A) populations living in an area (B) natural resources present in an area (C) members of a species on Earth (D) environments on Earth

Ex Output:
A


Ex Input:
In which of the following cases would a decrease in friction be most beneficial?  
 (A) the friction between the shoes of a jogger and the jogging track (B) the friction between the wheels of a car and the surface of a road (C) the friction between a rotating pulley and the axle that supports the pulley (D) the friction between a rotating pulley and the rope that is used with the pulley

Ex Output:

C