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
Coronary vasodilatation is caused by ? 
Select and explain. 
A. Adenosine, B. Bradykinin, C. Histamine, D. Ergotamine
A: Adenosine
Answer: A: Adenosine 
Explanation: Ans. is 'a' i.e., Adenosine o Adenosine is used to induce brief coronary vasodilatation during ceain procedures.