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': 'Wet pillow syndrome is caused by \nSelect and explain. \nA. Risperidone, B. Haloperidol, C. Aripiprazole, D. Clozapine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Clozapine carries the side effect of sialorrhoea, termed as "Wet\xa0pillow syndrome".', 'role': 'assistant'}]