Schwangershaft protein is the other name of: (A) HCG, (B) Papp-1, (C) Pregnancy specific betal 1 glycoprotein, (D) Activin
Answer is C. Schwangershaft Protein:

It is the other name for pregnancy specific B1 glycoprotein.
Produced by trophoblast.
Can be detected 18 days after ovulation.
Its concentration rises steadily and reaches 200 mg/ml at term.
Role-measure of placental function for fertility control.