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: Medicine
[{'content': "An 18 years old boy presents with digital gangrene in third and fourth finger for last 2 weeks. On examination the blood pressure is 170/110 mm of Hg and all peripheral pulses were palpable. Blood and urine examinations were unremarkable. Antinuclear antibodies, Antibody to double standard DNA and antineutrophil cytoplasmic antibody were negative. The most likely diagnosis is - \nSelect and explain. \nA. Wegner's granulomatosis, B. Polyarteritis nodosa, C. Takayasu's arteritis, D. Systemic lupus erythematosis (SLE)", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]