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
The deficiency of all the following factors increases the incidence of thrombus formation except 
Select and explain. 
A. Lipoprotein A, B. Protein C, C. Anti-thrombin III, D. Protein-S
A: Lipoprotein A
Answer: A: Lipoprotein A 
Explanation: . Because deficiencies of antithrombin III,protein C ,pritein S,factor V of Leiden,thrombophila etc are the causes of thrombus formation. Refer page no 223 of SRB's manual of surgery 5th edition.