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': 'Following latrines are suitable for camps and temporary use except \nSelect and explain. \nA. Shallow trench latrine, B. Septic tank, C. Borehole latrine, D. Pit latrine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]