A particular hormone 'X' is secreted by the ovary in the later phase of pregnancy. It is observed that 'X', along with two other hormones 'Y' and 'Z' (which are secreted by the placenta), is produced in women only during pregnancy. Identify the hormone 'X'.

Step-by-step solution

hCG, hPL, and relaxin are the hormones produced in women only during pregnancy. Among these, hCG and hPL are secreted by the placenta, representing hormones 'Y' and 'Z'. Relaxin is secreted by the ovary in the later phase of pregnancy, which corresponds to hormone 'X'. Progesterone and estrogen are not exclusive to pregnancy, as they are also secreted during the normal menstrual cycle. Answer: Relaxin