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
Isolation in patient with Salmonellosis is done 
Select and explain. 
A. Till fever subsides, B. Till 3 stool test are negative, C. Till Widal becomes negative, D. For 48 hrs of Chloramphenicol treatment
B: Till 3 stool test are negative
Answer: B: Till 3 stool test are negative 
Explanation: None