Which of the following is a presumptive sign of pregnancy?

A presumptive sign of pregnancy refers to changes that a woman might experience that could indicate pregnancy but are not definitive. These signs are often subjective and can also be attributed to other conditions. Urinary frequency is considered a presumptive sign because it may occur due to hormonal changes from the pregnancy, such as increased levels of human chorionic gonadotropin (hCG) and changes in metabolism, which can affect kidney function and increase blood flow to the pelvic area. Consequently, this leads to increased urination.

In contrast, signs such as an audible fetal heartbeat and fetal movement felt by an examiner are considered positive or definitive signs of pregnancy, as they provide more concrete evidence of the presence of a fetus. Goodell's sign refers to the softening of the cervix and is classified as a probable sign; it indicates some physiological changes due to pregnancy but is more significant than presumptive signs. Therefore, urinary frequency aligns correctly with the definition of a presumptive sign due to its subjective nature and non-exclusive association with pregnancy.