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': 'All are included in sydney revision of sapporo criteria for Antiphospholipid antibody syndrome: \nSelect and explain. \nA. Vascular thrombosis, B. Livedo reticularis, C. 3 or more unexplained spontaneous aboions, D. Lupus anticoagulant in plasma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Livedo reticularis is not included in the diagnostic criteria for Antiphospholipid antibody syndrome. Ref: Harrisons principles of internal medicine, 18th edition: Page 2737', 'role': 'assistant'}]