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: Dental
For safe water or improved drinking water construction, the mechanical construction should be such that: 
Select and explain. 
A. It does protect contamination from teratogenic sources, B. It does not allow contamination from fecal matter, C. It does protect contamination from inorganic matter, D. It does not allow contamination from Zoological animals
B: It does not allow contamination from fecal matter
Answer: B: It does not allow contamination from fecal matter 
Explanation: None