This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Papulosquamous disorders, Subject name: Dental
[{'content': 'The impoant feature of psoriasis is - \nSelect and explain. \nA. Crusting, B. Scaling, C. Oozing, D. Erythema', 'role': 'user'}, {'content': "Answer: B \nExplanation: psoriasis:-chronic Inflammatory skin disease.Genetic predisposition. Psoriasis susceptibility 1 (PSORS1) is the most impoant susceptibility locus. Clinical features:-1. Classic lesion-Well defined erythematous plaque with a silvery white scales.2. Size varies from pin point papules to plaques.3. The scales are loosely adhered,and on renoval of scales,coherent scaling can be seen as if one scratches a wax candle ( signe de la tache de bougie).4. On complete removal of scales,a red moist membrane ,Bulkeley membrane, seen.5. On fuher scraping,punctate bleeding points are seen.-Auspitz's sign.This occurs due to suprapapillary thinning and capillary dilatation.6. A surrounding ring of hypopigmentation seen ,Woronoff's ring, seen associated with the treatment and implies a good response to treatment impoant features of psoriasis- 1.erythematous scaly plaques covered with loosely adherent silvery scales. 2.auspitz sign 3.koebners phenomenon IADVL textbook of dermatology,page 1032", 'role': 'assistant'}]