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:
In the human body, which system functions primarily to defend the body against disease?  
 (A) digestive (B) immune (C) nervous (D) respiratory

Ex Output:
B


Ex Input:
The parts of plants that make seeds are the  
 (A) roots. (B) stems. (C) flowers. (D) leaves.

Ex Output:
C


Ex Input:
Paper chromatography is a process used to separate mixtures of substances into their components. The components are carried by a mobile phase through a stationary phase made of absorbent paper. An investigation analyzed a sample of black ink to determine its components.Which property allows the components to separate?  
 (A) the solubility of the components in the mobile phase (B) the evaporation rate of the components at a certain temperature (C) the magnetic property of the components (D) the thickness of the paper used as the stationary phase

Ex Output:

A