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
Nitrates cannot be used in : 
Select and explain. 
A. Angina pectoris., B. Billiary colic., C. Renal colic., D. Cyanide poisoning.
C: Renal colic.
Answer: C: Renal colic. 
Explanation: Nitrates are not used in renal colic.