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.

[EX Q]: A student uses a bar graph to display the amount of rainfall per week over a 3-month period. Which other method of presentation is appropriate for the data?
(A) a table (B) a pie chart (C) a photograph (D) a written paragraph
[EX A]: A

[EX Q]: Leucine is one of the amino acids your body needs but cannot make. Which of these happens so that the human body can obtain leucine?
(A) The body converts other amino acids to leucine. (B) The body stores carbohydrates containing leucine. (C) The body breaks down fatty acids to obtain leucine. (D) The body digests protein in food to obtain leucine.
[EX A]: D

[EX Q]: Which kind of bridge uses cables for support?
(A) a truss bridge (B) a suspension bridge (C) a beam bridge (D) a cantilever bridge
[EX A]:
B