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
Shoest acting calcium channel blocker ? 
Select and explain. 
A. Verapami I, B. Amlodipine, C. Nimodipinc, D. Diltiazam
C: Nimodipinc
Answer: C: Nimodipinc 
Explanation: Ans. is 'c' i.e., Nimodipine Nimodipine is shoest acting CCB. -Katzung 10/1/2 - 191 Nimodipine selectively relaxes cerebral vasculature - can be used in subarachnoid haemmorrhage or ruptured congenital intracranial aneurism. Amlodipine is longest acting CCB. Amlodipine has maximum oral bioavailabilitv. Nisoldipine has minimum oral bioavailability.