This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2019, Subject name: Dental
Which is a true association: 
Select and explain. 
A. Lichen planus and malignant melanoma, B. Melasma and malignant melanoma, C. Psoriasis and metabolic syndrome, D. Vitiligo and metabolic syndrome
C: Psoriasis and metabolic syndrome
Answer: C: Psoriasis and metabolic syndrome 
Explanation: Chronic plaque psoriasis is an immune mediated inflammatory skin disease that is strongly associated with the clinical features of the metabolic syndrome (Mets), including abdominal obesity, hypeension, atherogenic dyslipidemia, type 2 diabetes, insulin resistance and nonalcoholic atty liver disease. There are complex interrelationships between the metabolic syndrome and chronic inflammation. Vitiligo is associated with autoimmune diseases like Thyroid diseasea (hypehyroidism and hypothyroidism ), Pernicious anaemia, Addison disease, Diabetes, Myasthenia gravis, Alopecia areata