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': 'Most common site of hypertrophic keloid is - \nSelect and explain. \nA. Face, B. Leg, C. Presternal area, D. Arm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Keloids → It is a scar which shows extreme overgrowth so that scar tissues grows beyond the limits of original wounds and shows no tendency to resolve.\nKeloids grow on particular sites, these are -\n\n\nCentral chests (probably most common, not sure)\nBack\nShoulder\nEarlobes\n\nOther points about Keloids & hypertrophic scars \n\nHypertrophic scars (HTS) and keloids represent an overabundance of fibroplasia in the dermal healing process. They are both characterized by excessive collagen deposition versus collagen degradation.\nHTS rise above the skin level but stay within the confines of the original wound and often regress over time.\nKeloids are defined as scars that grow beyond the border of the original wound and rarely regress spontaneously.\nBoth HTS and keloids occur after trauma to the skin, and may be tender, pruritic, and cause a burning sensation.\nKeloids are more prevalent among dark pigmented ethnicitics (i.e. Africans, Asians & Hispanics)\nHTS usually develop within 4 weeks after trauma Keloids tend to occur 3 months to years after the trauma.', 'role': 'assistant'}]