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': 'Ketamine produces : \nSelect and explain. \nA. Emergence delirium, B. Pain on injection, C. Bronchoconstriciton, D. Depression of cardiovascular system', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]