This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
A patient is admitted with 3rd episode of deep venous thrombosis. There is no history of any associated medial illness. All of the following investigations are required for establishing the diagnosis except 
Select and explain. 
A. Antibodies to factor VIII, B. Antibodies to cardiolipin, C. Antithrombin II deficiency, D. Protein C deficiency
A: Antibodies to factor VIII
Answer: A: Antibodies to factor VIII 
Explanation: It is a cqpillary vascular malformation also called as naevus simplex. Commonly seen in 40% of new borns. It is present at bih,usually involves nape of neck,face,scalp,limbs. With age,it goes for spontaneous regression and disappears completely,usually in one year.