This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adverse Drug Effect, Subject name: Pharmacology
Maximum tachycardia is seen with- 
Select and explain. 
A. Nifedipine, B. Verapamil, C. Propanolol, D. Amlodipine
A: Nifedipine
Answer: A: Nifedipine 
Explanation: Ans. is 'a' i.e., Nifedipine Cardiac effectsVerapamilNifedipineDiltiazamo Heart rateo AV conductiono Contractilityo Output|||-,|-,||-|||,-||,|-,|Note:o Verapamil and to a lesser extent diltiazem delay the recovery of Ca++ channel in heart - Cardiodepressant action (| heart rate, conduction, contractility).o Nifedipine (DHPs) does not delay the recovery of Ca^ channel - No cardiodepressant action,o Instead, nifedipine causes reflex sympathetic stimulation - Tachycardia and increased contractility.