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.
--------
Question: Some people carry a mutated allele of a particular gene that makes them resistant to HIV infection and AIDS. Which best describes this type of mutation?  
 (A) beneficial (B) asexual (C) harmful (D) unicellular

Answer: A


Question: Which of the following units best represents the density of an object?  
 (A) kg (B) hr (C) m/s^2 (D) g/cm^3

Answer: D


Question: A litter of kittens have traits that are similar to both the mother cat and the father cat. Which best explains this situation?  
 (A) The kittens are provided the same kind of milk from their mother as they grow. (B) The kittens inherit some of their traits from their mother and some from their father. (C) The kittens are kept at the same temperatures by their mother when they are first born. (D) The kittens are taught by their parents to have similar traits.

Answer:
B