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 discharging sinus with bone particle is seen in \nSelect and explain. \nA. Chronic osteomyelitis, B. Acute osteomyelitis, C. Subacute osteomyelitis, D. Garre’s osteomyelitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Clinical features of chronic osteomyelitis \n\nThe commonest presenng symptom is a chronic discharging sinus, a history of bone piece discharge from the chronic sinus is considered diagnosc of chronic osteomyelis.\nPain is minimal or absent.\nGeneralized symptoms of acute osteomyelis are not present except in acute excacerbaons.\nOn examinaon there is irregular thickening of bone. Mild tenderness may be seen in deep palpaon. Adjacent joint may be sff.\n\nRadiological features\nFollowing are radiological features : -\n\nThickening and irregularity of the corces.\nPatchy sclerosis\nBone cavity : This is seen as an area of rarefacon surrounded by sclerosis.\nSequestrum(Manipal 97): This appears denser than the surrounding normal bone because the decalcificaon which occurs in normal bone, does not occur in dead bone. Granulaon ssue surrounding the sequestrum gives rise to a radiolucent zone around it. A sequestrum may be visible in so ssue.\nInvolucrum and cloacae may be visible', 'role': 'assistant'}]