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
Following latrines are suitable for camps and temporary use except 
Select and explain. 
A. Shallow trench latrine, B. Septic tank, C. Borehole latrine, D. Pit latrine
B: Septic tank
Answer: B: Septic tank 
Explanation: None