Which condition is associated with watery, gray, and "fishy-smelling" discharge accompanied by vaginal spotting?

Bacterial vaginosis is characterized by a disruption in the normal balance of bacteria in the vagina, leading to an overgrowth of certain bacteria. This condition typically presents with a watery, gray discharge that often has a distinctive "fishy" odor, especially after sexual intercourse or during menstruation. The presence of vaginal spotting can also occur but is less common.

This condition differs from other options because candidiasis usually manifests with a thick, white discharge resembling cottage cheese, and it does not typically have a strong odor. Gonorrhea may produce purulent discharge and has associated symptoms such as pain or discomfort during urination but is not known for a fishy-smelling discharge. Trichomoniasis often leads to a frothy discharge and may come with symptoms like itching or irritation, but the discharge does not usually have the same characteristic odor associated with bacterial vaginosis. Thus, the description of watery, gray, "fishy-smelling" discharge is a classic sign of bacterial vaginosis.