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
Presumptive count includes 
Select and explain. 
A. No E. Coli, B. Coliform but not only E., C. Gram negative bacilli, D. Any bacteria
B: Coliform but not only E.
Answer: B: Coliform but not only E. 
Explanation: Presumptive coliform test

In presumptive coliform test the most probable number of all coliform organisms (not only E.coh) are counted → Presumptive coliform count.

The methods are : -

Multiple tube method
Membrane filtration technique.


After analysing presumptive coliforrn count, E.coli count is confirmed by other tests, e.g., by Eijkman test or indole production..