Hormones secreted by the placenta to maintain pregnancy are hCG, hPL, progestogen, estrogens, relaxin, oxytocin, prolactin, glucocorticoids

The placenta acts as an endocrine gland during pregnancy. It produces hormones, including human chorionic gonadotropin (hCG), progesterone, estrogen, and human placental lactogen (hPL). These hormones are involved in maintaining pregnancy and the related changes in the pregnant female.Thus, the correct answer is option A.