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
[{'content': 'A patient presented with anaphylactic reactions developed angioedema. Drug of choice for treating this condition is: \nSelect and explain. \nA. Adrenaline, B. Coicosteroid, C. Antihistaminics, D. Sodium chromoglycate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Patients with immediate hypersensitivity (histamine-mediated) reactions are managed with epinephrine, antihistamines and coicosteroids. The syndrome of bronchospasm, mucous membrane congestion, angioedema, and severe hypotension usually responds rapidly to the parenteral administration of epinephrine, 0.3-0.5 mg (0.3-0.5 mL of a 1:1000 epinephrine solution). Ref: Biaggioni I., Robeson D. (2012). Chapter 9. Adrenoceptor Agonists & Sympathomimetic Drugs. In B.G. Katzung, S.B. Masters, A.J. Trevor (Eds), Basic & Clinical Pharmacology, 12e.', 'role': 'assistant'}]