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 one of the following drugs is most commonly employed in an attack of angina pectoris? 
Select and explain. 
A. Sodium nitrate, B. Epinephrine, C. Nitroglycerina, D. Isosorbide dinitrate
C: Nitroglycerina
Answer: C: Nitroglycerina 
Explanation: None