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': 'ICATIBANT IS A ? \nSelect and explain. \nA. bradykinin B 1 antagonist, B. bradykinin B 2 antagonist, C. bradykinin B 3 antagonist, D. histamine receptor H3 antagonist', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]