Serum from Chris, the Snake Handler, Agglutinated Sheep Red Blood

Serum from Chris, the snake handler, agglutinated sheep red blood cells but after absorption with either guinea pig kidney or bovine erythrocytes, it did not agglutinate the sheep red blood cells. The serum gave a positive result in the Acceava for infectious mononucleosis. Chris has

A) infectious mononucleosis
B) syphilis
C) serum sickness antibodies
D) Forssman antibodies