This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Psoriasis, Subject name: Dental
[{'content': 'Most impoant feature of psoriasis? \nSelect and explain. \nA. Crusting, B. Scaling, C. Oozing, D. Erythema', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Psoriasis (Papulosquamous disease) Common inflammatory scaling dermatosis (well-demarcated erythematous plaques surmounted by characteristic silvery white scaling) with a B/L symmetric distribution & is associated with seronegative spondyloahropathy. Scaling Conditions Psoriasis Atopic Dermatitis Contact Dermatitis Lichen Simplex Chronicus Lichen Planus', 'role': 'assistant'}]