This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune skin disorders, Subject name: Dental
[{'content': 'Omenn syndrome is a form of \nSelect and explain. \nA. Squamous cell carcinoma, B. Chronic mucocutaneous candidiasis, C. IgA deficiency, D. Severe combined immunodeficiency', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Omenn syndrome is an autosomal recessive form of severe combined immunodeficiency (SCID) characterized by erythroderma (skin redness), desquamation (peeling skin), alopecia (hair loss), chronic diarrhoea, failure to thrive, lymphadenopathy (enlarged lymph nodes), eosinophilia, hepatosplenomegaly, and elevated serum IgE levels. Ref Harrison 20th edition pg 1234', 'role': 'assistant'}]