This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Pharmacology), Subject name: Pharmacology
[{'content': 'A 70 years old man was administered penicillin i.v. Within 5 minutes, he developed generalized urticaria, swelling of lips, hypotension and bronchospasm. The first choice is to administer: \nSelect and explain. \nA. Chlorpheniramine inj, B. Epinephrine inj., C. High dose hydrocortisone tablet, D. Nebulized salbutamol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (B) Epinephrine inj (Ref: KDT 8th/e p149)Epinephrine (adrenaline) is the drug of choice for anaphylactic shock. It is given by s.c. or i.m. route in a concentration of 1:1000. Intravenous route is rarely used but at much lower (1:10,000) concentration.', 'role': 'assistant'}]