This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and Metabolic disorders,Systemic conditions ,Genodermatoses, Connective tissue disorders,Photodermatoses, Subject name: Dental
[{'content': 'Periungual telangiectasias are pathognomonic signs of the following except: \nSelect and explain. \nA. Polyaeritis nodosa, B. Lupus erythematosus, C. Systemic sclerosis, D. Diabetes mellitus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Periungual telangiectasias - Pathognomonic signs of three major autoimmune connective tissue diseases: Lupus erythematosus Systemic sclerosis DM', 'role': 'assistant'}]