The correct answer is C. Gynecology.
Gynecology is the medical specialty that deals with the health of the female reproductive system. This includes the vagina, uterus, ovaries, fallopian tubes, and breasts. Gynecologists diagnose and treat conditions that affect these organs, such as menstrual disorders, infertility, sexually transmitted infections (STIs), and cancer.
Gerontology is the study of the aging process and the diseases and conditions associated with it. Gastroenterologists are doctors who specialize in the diagnosis and treatment of disorders of the digestive system, which includes the esophagus, stomach, small intestine, large intestine, and rectum.
None of the other options are correct.