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: Dental
An increased incidence of vitiligo is found is – 
Select and explain. 
A. Psoriasis, B. Nutritional deficiency, C. Old age, D. Diabetes mellitus
D: Diabetes mellitus
Answer: D: Diabetes mellitus 
Explanation: Vitiligo is associated with other autoimmune disorders like Diabetes mellitus, Graves disease, Hashimoto thyroiditis, Addisons disease, MEN.