TASK DEFINITION: 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.
PROBLEM: Joanne's science teacher cautioned the class to be skeptical when learning about new scientific discoveries. Why is it important to be skeptical about new discoveries in science?
(A) because many scientific discoveries are not based on facts (B) because most scientific discoveries have no scientific value (C) because most scientists make errors when formulating scientific discoveries (D) because all scientific discoveries must be examined critically before they can be accepted

SOLUTION: D

PROBLEM: City administrators can encourage energy conservation by
(A) lowering parking fees (B) building larger parking lots (C) decreasing the cost of gasoline (D) lowering the cost of bus and subway fares

SOLUTION: D

PROBLEM: A student is using descriptions to classify organisms. One organism is described as having sense organs to detect heat, laying eggs to reproduce, using venom for protection, and having the ability to change body temperature with its surroundings. How would the student classify this organism?
(A) bacteria (B) mammal (C) reptile (D) bird

SOLUTION:
C