This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Which of the following causative factors is not involved in the pathogenesis of Diabetic gangrene \nSelect and explain. \nA. Infection, B. Myelopathy, C. Atherosclerosis, D. Osteoahropathy', 'role': 'user'}, {'content': "Answer: B \nExplanation: Others Are Neuropathy, Microangiopathy, Glycosylation Of Hb And Proteins, Hyperglycemia . ref - Srb's manual of surgery , Harriosns internal medicine 20edition", 'role': 'assistant'}]