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: Anaesthesia
[{'content': 'Drug used to prolong action of LA in Hypertensive pts – \nSelect and explain. \nA. Clonidine, B. Felypressin, C. Dexmeditomidate, D. Noradrenalin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Vasoconstrictor are used along with local anaesthetics.\nAdrenaline is the most commonly used vasoconstrictor. Less commonly phenylephrine is also used. Felypressin (synthetic vasopressine) does not effect BP & HR → Preferred in patients with cardiovascular disease.', 'role': 'assistant'}]