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
[{'content': 'What is the recommended period of isolation for shigellosis? \nSelect and explain. \nA. Until 1 negative stool culture., B. Until 2 consecutive negative stool cultures, C. Until 3 consecutive negative stool cultures, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In cases of shigellosis and salmenollosis, the recommended period of isolation is until 3 consecutive negative stool cultures. Ref: Park 21st edition, page 110-111.', 'role': 'assistant'}]