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': "Steroid suphatase deficiency is seen in \nSelect and explain. \nA. Ichthyosis vulgaris, B. Lamellar Ichthyosis, C. 'X' linked recessive icthyosis, D. None of the above", 'role': 'user'}, {'content': 'Answer: C \nExplanation: X-linked ichthyosis (abbreted XLI) is a skin condition caused by the hereditary deficiency of the steroid sulfatase (STS) enzyme that affects 1 in 2000 to 1 in 6000 males. XLI manifests with dry, scaly skin and is due to deletions or mutations in the STS gene. Ref Harrison20th edition pg 1332', 'role': 'assistant'}]