This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
[{'content': 'Berkley membrane is seen in the following cutaneous condition: \nSelect and explain. \nA. Psoriasis, B. Pemphigus, C. Tinea capitis, D. Pityriasis rubra', 'role': 'user'}, {'content': "Answer: A \nExplanation: Psoriasis is characterized by well-circumscribed, sharply demarcated erythematous papules and/or plaques. These are covered by dry, brittle, silvery or grayish white, loosely adherent, micaceous scales. The scales are disposed in lamellar fashion. Occasionally a white blanching ring is seen around the psoriatic lesions, known as Woronoff ring. On grattage, silvery white scales come off in layers. After their removal, a characteristic coherence is observed, as if one scratches on a wax candle (candle grease sign). On fuher grattage, a thin peel like membrane, Berkley's membrane, is seen which comes off as a whole. On its removal, a wet surface with multiple pinpoint bleeding is revealed. This is called Auspitz sign. Ref: Textbook of Clinical Dermatology By Sehgal, 4th edition, Page 127.", 'role': 'assistant'}]