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: Social & Preventive Medicine
[{'content': 'Spread of which disease cannot be controlled by isolation ? \nSelect and explain. \nA. Diphtheria, B. Neonatal tetanus, C. Cholera, D. Mumps', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., Neonatal tetanus", 'role': 'assistant'}]