In which condition does the discharge have no smell and a thick white appearance?

Candidiasis is marked by a discharge that typically has a thick, white appearance resembling cottage cheese, and it is characteristically odorless. This condition arises from an overgrowth of the fungus Candida, which can occur due to various factors, including antibiotic use, hormonal changes, or a compromised immune system. The lack of a foul odor is a distinguishing feature, as many other vaginal infections tend to produce a strong or unpleasant smell.

In contrast, bacterial vaginitis often leads to a discharge that is thin, grayish, and typically has a fishy odor, particularly after sexual intercourse. Trichomoniasis is usually associated with a yellow-green discharge that may have a strong, unpleasant smell. Chlamydia can present with a variety of symptoms, including a yellowish discharge that also may have an odor, and often does not appear as a thick, white discharge.

Thus, the characteristics of Candidiasis make it identifiable by its thick, white, and odorless discharge, differentiating it from the symptoms and signs of the other mentioned conditions.