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 of the following correctly lists the organizational hierarchy of organisms from simplest to most complex?  
 (A) cells, organs, tissues, organ systems, organisms (B) cells, tissues, organs, organ systems, organisms (C) tissues, cells, organs, organ systems, organisms (D) tissues, organs, cells, organ systems, organisms

Ex Output:
B


Ex Input:
What is the downward movement of water through pores and other spaces in soil due to the force of gravity?  
 (A) percolation (B) evaporation (C) precipitation (D) condensation

Ex Output:
A


Ex Input:
Some machines can remove the salt that is in seawater. How does removing salt from seawater most help people?  
 (A) provides useable drinking water (B) creates cleaner water for rivers (C) enables more fish to live in lake water (D) allows more plants to grow along rivers

Ex Output:

A