Final answer:
The hormone not produced by the placenta is human chorionic thyrotropin (B). The placenta secretes various hormones crucial for pregnancy, but thyrotropin releasing hormone is produced by the hypothalamus.
Step-by-step explanation:
The hormone that is not produced by the placenta is human chorionic thyrotropin (B). The placenta secretes various hormones that play crucial roles during pregnancy, such as human placental lactogen (hPL), which prepares the breasts for lactation, and relaxin, which helps prepare the body for childbirth by increasing the elasticity of the pubic symphysis joint and dilating the cervix during labor. Another hormone secreted by the placenta is inhibin, which plays a role in regulating the levels of follicle-stimulating hormone (FSH). It is important to note that the hypothalamus produces thyrotropin releasing hormone (D), not the placenta.