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.

[Q]: Diseases that can be transmitted between organisms are  
 (A) infectious. (B) inherited. (C) environmental. (D) congenital.
[A]: A


[Q]: Which of the following forms of energy is released or absorbed in most chemical reactions?      
 (A) light energy (B) electrical energy (C) sound energy (D) heat energy
[A]: D


[Q]: Compared to other stars in our galaxy, which is the best description of our Sun?  
 (A) larger size, higher temperature (B) smaller size, higher temperature (C) larger size, average temperature (D) average size, average temperature
[A]:
D