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 are not used in? 
Select and explain. 
A. CHF, B. Cyanide poisioning, C. renal colic, D. Esophageal spasm
C: renal colic
Answer: C: renal colic 
Explanation: C; renal colic