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: Pharmacology
Which of the following enzyme metabolizes Nitrates to produce Nitric oxide (NO) 
Select and explain. 
A. Alcohol dehydrogenase, B. Nitrate reductase, C. Aldehyde dehydrogenase, D. Phosphodiesterase - 5
C: Aldehyde dehydrogenase
Answer: C: Aldehyde dehydrogenase 
Explanation: None