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: Medicine
Period of isolation in salmonella infection is till 
Select and explain. 
A. 72 hours after chemotherapy, B. Widal negative, C. 3 consecutive stool cultures are negative, D. Urine culture is negative twice
C: 3 consecutive stool cultures are negative
Answer: C: 3 consecutive stool cultures are negative 
Explanation: None