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
All are included in sydney revision of sapporo criteria for Antiphospholipid antibody syndrome: 
Select and explain. 
A. Vascular thrombosis, B. Livedo reticularis, C. 3 or more unexplained spontaneous aboions, D. Lupus anticoagulant in plasma
B: Livedo reticularis
Answer: B: Livedo reticularis 
Explanation: Livedo reticularis is not included in the diagnostic criteria for Antiphospholipid antibody syndrome. Ref: Harrisons principles of internal medicine, 18th edition: Page 2737