This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Necrobiosis lipoidica is seen in - 
Select and explain. 
A. DI, B. Lyme disease, C. Diabetes mellitus, D. Symmonds disease
C: Diabetes mellitus
Answer: C: Diabetes mellitus 
Explanation: Ans is option 3- DM Necrobiosis lipoidica is a rare granulomatous skin disorder classically described in patients with diabetes. Also called Oppenheim-Urbach disease. Mostly involves the skin of the anterior aspect of the legs. Correlated to the severity of the diabetic microangiopathy.