This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': "In dermatomyositis which is not seen \nSelect and explain. \nA. Salmon patch, B. Gottron's papules, C. Peringual telangiectasia, D. Mechanic finger", 'role': 'user'}, {'content': "Answer: A \nExplanation: *DM is a distinct entity identified by a characteristic rash accompanying or more often preceding muscle weakness. this includes heliotrope rash ,erythema of knuckles with a raised violaceous scaly eruption(Gottron's sign). *Dilated capillary loops at the base of fingernails are also characterised *Palma areas of fingers may become rough and cracked with irregular diy horizontal lines resembling mechanics hands. Ref Harrison20th edition pg 2367", 'role': 'assistant'}]