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: Surgery
[{'content': 'Which is not a feature of pilonidal sinus: \nSelect and explain. \nA. Branching tracts are common, B. Recurrence is uncommon, C. Bony involvement is uncommon, D. Seen in Drivers', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "Recurrence is common, even though adequate excision of the track is carried out." - Bailey & Love "Once an acute episode has resolved, recurrence is common"- Schwartz 9/e p1067\nPilonidal disease\nPilonidal disease consists of a hair-containing abscess or chronic sinus, occurring in the intergluteal cleft.\nIt is an acquired disease\nAlthough earlier it was thought to be a congenital disease, it is now considered to be an acquired infection of natal cleft hair follicles. The hair follicles become infected and rupture into the subcutaneous tissues to form a pilonidal abscess. Hair from surrounding skin is pulled into the abscess cavity by the friction generated by the gluteal muscles during walking.\nMore common in males\nThe incidence of pilonidal disease is more common in males (3:1 male: female ratio) between ages 15 & 40 with peak incidence between 16 & 20 yrs.\nPilonidal ds is more common in people with more body hair (hirsute). The ds. is almost rare in persons with less body hair.\nTreatment of choice is surgery\nPilonidal sinus should be excised along with the secondary openings. (But only after controlling acute infection).\nAcute pilonidal abscesses and sinus ds can be managed by simple incision and drainage (under local anesthesia).', 'role': 'assistant'}]