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
DOC for acute attack of Hereditary angioneurotic edema 
Select and explain. 
A. Danazol, B. Cl, inhibitor concentrate, C. Icatibant, D. Methylprednisolone
B: Cl, inhibitor concentrate
Answer: B: Cl, inhibitor concentrate 
Explanation: 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