This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Pit latrine has a depth of ____ feet \nSelect and explain. \nA. 4-Feb, B. 6-Apr, C. 10-Jun, D. 12-Oct', 'role': 'user'}, {'content': "Answer: D \nExplanation: Dug well latrine or pit latrine is an improvement over borehole latrine. A circular pit of 75 cm in diameter and 3-3.5 m (10-12 ft) deep is dug to the ground for the reception of the night soil. The pit may be lined by pottery rings. Merits are: easy to construct, has a longer life than borehole latrine. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 821", 'role': 'assistant'}]