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: Orthopaedics
[{'content': 'Chronic persistent neutrophilic discharge is seen in - \nSelect and explain. \nA. Chronic osteomyelitis, B. Acute osteomyelitis, C. Septic arthritis, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The commonest presenting symptom of chronic osteomyelitis is chronic discharging sinus.\nDischarging sinus contains pus (i.e. mixture of neutrophils and other cells).', 'role': 'assistant'}]