Patient Serum Is Mixed with Sheep Red Blood Cells That

Patient serum is mixed with sheep red blood cells that have been sensitized with Treponema pallidum antigens as well as with unsensitized red blood cells in a separate well.Agglutination was observed in the well with sensitized red blood cells and not in the well with unsensitized red blood cells.What is the interpretation of these results?

A) positive for anti-Treponema pallidum antibodies
B) positive for heterophile antibodies
C) negative for anti-Treponema pallidum antibodies
D) negative for anticardiolipin antibodies