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: Microbiology
Treatment for acute attack of Hereditary angioneurotic edema 
Select and explain. 
A. Ecallantide, B. Icatibant, C. Danazol, D. C1 INH Concentrate
D: C1 INH Concentrate
Answer: D: C1 INH Concentrate 
Explanation: C1 INH Concentrate - Treatment of choice.