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 of the following does not cause bradycardia 
Select and explain. 
A. Propranolol, B. Hydralazine, C. Clonidine, D. Reserpine
B: Hydralazine
Answer: B: Hydralazine 
Explanation: Ans. is 'b' i.e., Hydralazine o Hydralazine causes reflex tachycardia. o Propranolol, clonidine and reserpine are sympatholytic drugs cause bradycardia.