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: Pharmacology
[{'content': 'Which of the following is second generetion H1? antihistaminic - \nSelect and explain. \nA. Cetrizine, B. Promethazine, C. Cinnarizine, D. Pheneramine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Cetrizine", 'role': 'assistant'}]