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:
Some kinds of fish live most of their lives in salt water but lay their eggs in freshwater. Their ability to survive in different environments is an example of  
 (A) adaptation (B) developmental stages (C) a habit (D) selective breeding

Ex Output:
A


Ex Input:
Historically, how has the compass been used?  
 (A) for navigation (B) to predict weather (C) to measure temperature (D) for mineral identification

Ex Output:
A


Ex Input:
Last year Steve was shorter than his brother. This year Steve is taller than his brother. What cell process is directly responsible for Steve's growth?  
 (A) diffusion (B) mitosis (C) osmosis (D) respiration

Ex Output:

B