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: Skin
[{'content': 'Most common site of Necrobiosis lipioidica dibeticorum is? \nSelect and explain. \nA. Face, B. Neck, C. Front of leg, D. Back of leg', 'role': 'user'}, {'content': "Answer: C \nExplanation: Front of leg REF: Rook's 8`h edition p. 60.13 Most common site of Necrobiosis lipioidica dibeticorum is pretibial skin, lesions may occur on trunk, penis or may be diffuse", 'role': 'assistant'}]