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: Ophthalmology
[{'content': 'Occurrence of diplopia, dysphagia, dysahria, blurring of vision and muscle weakness could be due to: \nSelect and explain. \nA. Diphtheria, B. Botulism, C. Infantile beriberi, D. Myasthenia gravis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans.Botulism', 'role': 'assistant'}]