This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Dental
Omenn syndrome is 
Select and explain. 
A. Squamous cell carcinoma, B. Chronic mucocutaneous candidiasis, C. IgA deficiency, D. SCID
D: SCID
Answer: D: SCID 
Explanation: Omenn syndrome is an autosomal recessive form of severe combined immunodeficiency (SCID) characterized by erythroderma (skin redness), desquamation (peeling skin), alopecia (hair loss), chronic diarrhea, failure to thrive, lymphadenopathy (enlarged lymph nodes ), eosinophilia, hepatosplenomegaly , and elevated serum Ref Harrison20th edition pg 1278