<prompt> Common antibody seen in antiphospholipid syndrome:AnticardiolipinAnti-b2GPIANAAnti-Sm  <response>: 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. 