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
A 28-year-old woman with diabetes presents with lesions on her leg. They are not painful, and have a central depression and raised irregular margin. Which of the following is the most likely diagnosis? 
Select and explain. 
A. eruptive xanthomas, B. necrobiosis lipoidica diabeticorum, C. gangrene, D. staphylococcal infection
B: necrobiosis lipoidica diabeticorum
Answer: B: necrobiosis lipoidica diabeticorum 
Explanation: (b) Source: (Kasper, p. 2169)This lesion is more frequent in females and may antedate other clinical signs and symptoms of diabetes. The plaques are round, firm, and reddish-brown to yellow in color. They most commonly involve the legs but can also involve the hands, arms, abdomen, and head.