This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypeension, Arrhythmias, Dyslipidemia, Subject name: Pharmacology
[{'content': 'Calcium channel blocker causing cerebral vasodilatation is:- \nSelect and explain. \nA. Nimodipine, B. Felodipine, C. Amlodipine, D. Nitrendipine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Nimodipine (DHPs)- Blocks Ca2+ channel only in cerebral blood vessels-Cerebral vasodilation Used in subarachnoid hemorrhage (SAH). Felodipine is approved for Tx of Raynaud's disease. Amlodipine has higher oral bioavailability- used in hypeension Nitrendipine - it has been shown to release NO from endothelium & inhibit cAMP phosphodiesterase - vasodilation - indicated in hypeension & angina pectoris.", 'role': 'assistant'}]