This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
The level of which one of the following compounds is elevated in bronchial asthama - 
Select and explain. 
A. PGI2, B. PGH2, C. Leukotrienes, D. Thromboxane
C: Leukotrienes
Answer: C: Leukotrienes 
Explanation: None