This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin lesions and disorders of pigmentation, Subject name: Dental
Vitiligo is associated with the following except - 
Select and explain. 
A. Addison's disease, B. MEN syndrome, C. Pernicious anemia, D. Crohns disease
D: Crohns disease
Answer: D: Crohns disease 
Explanation: VITILIGO Acquired,idiopathic disorder characterised by hypomelanosis of skin and hair together with the development of white macules with an absence of melanocytes on microscopy. Associations of vitiligo Pernicious anemis addisons disease graves disease hyper and hypothyroidism thyroiditis hyperparathyroidism diabetes mellitus internal malignancy antibodies are present against thyroglobulin,gastric parietal cells ,adrenal antigens most common association is thyroid disorders IADVL textbook of dermatology page 753