You are given a science question (hard-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.

Input: Consider Input: During which phase of meiosis does the separation of homologous chromosomes occur?  
 (A) prophase (B) anaphase (C) metaphase (D) telophase

Output: B


Input: Consider Input: Which factors can have the greatest effect on the health of a river system?  
 (A) type of soil and salinity (B) nitrate levels and turbidity (C) human consumption and pH (D) natural disasters and tidal changes

Output: B


Input: Consider Input: Anna's class counted the number of butterflies in the school garden for an assignment. Anna's results were different from the rest of the class. What should she do?  
 (A) Change the assignment. (B) Leave the results alone. (C) Match her results with the class. (D) Ask the teacher to count for her.


Output: B