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
[{'content': 'Coronary vasodilatation is caused by ? \nSelect and explain. \nA. Adenosine, B. Bradykinin, C. Histamine, D. Ergotamine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Adenosine o Adenosine is used to induce brief coronary vasodilatation during ceain procedures.", 'role': 'assistant'}]