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
Man is the principal reservoir for which of the following enteric pathogen: 
Select and explain. 
A. E. histolytica, B. Pseudomonas, C. Klebsiella, D. None of the above
A: E. histolytica
Answer: A: E. histolytica 
Explanation: None