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: Medicine
[{'content': 'Secretory diarrhoea is found in- \nSelect and explain. \nA. Thyrotoxicosis, B. Shigella infection, C. Lactase deficiency, D. Glucose intake', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]