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 not a 2nd generation antihistamine \nSelect and explain. \nA. Cetrizine, B. Cyclizine, C. Loratidine, D. Fexofenadine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Cyclizine', 'role': 'assistant'}]