This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infections, Subject name: Dental
Most common site of Necrobiosis lipioidica diabeticorum is 
Select and explain. 
A. Face, B. Neck, C. Front of leg, D. Back of leg
C: Front of leg
Answer: C: Front of leg 
Explanation: Necrobiosis lipoidica: etiology: diabetes mellitus leading to angiopathy histology: palisade get granuloma around a degenerated collagen Clinical features: erythematous papules,plaques,on shins symmetrically distributed, surface smooth waxy shiny. Central atrophy and ulceration with telengiectasia. Most common site of necrobiosis lipoidica diabeticorum Shins. association: diabetes-75% inflammatory bowel disease ,sarcoidosis, an a vasculitis syndromes treatment: intralesional steroids excision and grafting chloroquine control of diabetes has no specific effect on skin Iadvl textbook of dermatology page 1196