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]: What is one condition necessary to produce diamonds?  
 (A) high altitude (B) intense pressure (C) quick cooling (D) low temperatures
[EX A]: B

[EX Q]: Where does evaporation occur at the HIGHEST rate?  
 (A) rivers (B) streams (C) estuaries (D) glaciers
[EX A]: C

[EX Q]: Which of these conditions most likely results from infection?  
 (A) high blood sugar levels (B) swelling of throat tissues (C) numbness in fingers (D) blockage of blood vessels in the leg
[EX A]:
B