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': 'A 42–year–old man comes to the emergency department because of sudden-onset diarrhea and nausea directly following a fish barbeque at the beach. The next day, he cannot lift his left hand. Examination shows a wrist drop in the left hand. His pulse is 56/mm. However, his pupils are normal and there is no difficulty in eating. \n\nWhich of the following is the treatment for this condition? \nSelect and explain. \nA. Antihistamines, B. Conservative only, C. Gastric lavage, D. Suitable antibiotics', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]