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
ICATIBANT IS A ? 
Select and explain. 
A. bradykinin B 1 antagonist, B. bradykinin B 2 antagonist, C. bradykinin B 3 antagonist, D. histamine receptor H3 antagonist
B: bradykinin B 2 antagonist
Answer: B: bradykinin B 2 antagonist 
Explanation: Icatibant, New Bradykinin-Receptor Antagonist, in HAE Icatibant (Firazyr, Shire) synthetic selective decapeptide bradykinin B2 receptor competitive antagonist contains 5 non-natural amino acids to enhance resistance to peptidases Icatibant administered sc injection as single 30 mg peak concentration within 30 minutes, ref : kd tripathi 8th ed