This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
Common antibody seen in antiphospholipid syndrome: 
Select and explain. 
A. Anticardiolipin, B. Anti-b2GPI, C. ANA, D. Anti-Sm
A: Anticardiolipin
Answer: A: Anticardiolipin 
Explanation: Ans. A. AnticardiolipinExplanationAnticardiolipin IgG and IgM assays are the most sensitive, but the least specific.Anti-/52GPI IgG and IgM assays are more specific but less sensitive.