This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'DOC for acute attack of Hereditary angioneurotic edema \nSelect and explain. \nA. Danazol, B. Cl, inhibitor concentrate, C. Icatibant, D. Methylprednisolone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Medication C1 inhibitor concentrate (Plasma-derived) (Berine, Berine P, Cinryze. Recombinant C1 inhibitor Conestat alfa (Ruconest, Rhucin). Bradykinin Bzreceptor antagonist Icatibant (Firazyr). Kallikrein inhibitor Ecallantide (Kalbitor) REF : katzung pharmacology : 14th ed', 'role': 'assistant'}]