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': 'Granular layer is absent in \nSelect and explain. \nA. Epidermolytic hyperkeratosis, B. Lamellar ichthyosis, C. Ichtyosis vulgaris, D. X linked ichtyosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Granular layer is characteristically absent in ichthyosis vulgaris. iadvl textbook of dermatology page 700', 'role': 'assistant'}]