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': 'What is the most dangerous effect of belladonna in very young children ? \nSelect and explain. \nA. Dehydration, B. Hallucination, C. Hypertension, D. Hyperthermia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]