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.

[Q]: Which of these meals would give you most of the nutrients that you need?  
 (A) Meat, milk, and a piece of chocolate (B) Bread, vegetables, and fish (C) Vegetables, fruits, and water (D) Meat, fish, and bread
[A]: B


[Q]: Which of the following actions will increase the gravitational force between two masses, m_{1} and m_{2}, by the greatest amount?  
 (A) Halve the mass of m_{1} and halve the distance between m_{1} and m_{2}. (B) Halve the mass of m_{1} and double the distance between m_{1} and m_{2}. (C) Double the mass of m_{1} and halve the distance between m_{1} and m_{2}. (D) Double the mass of m_{1} and double the distance between m_{1} and m_{2}.
[A]: C


[Q]: Multicellular organisms have four main types of tissue which include muscle, epithelial, nerve, and connective tissue. Which organ consists mostly of nerve tissue?  
 (A) brain (B) liver (C) skin (D) stomach
[A]:
A