Which of the following is a yeast pathogen associated with vaginitis?

• A. Mycoplasma genitalium
• B. Trichomonas vaginalis
• C. Candida albicans
• D. Herpes simplex virus

Answer: (C)

Candida albicans is the yeast pathogen most commonly associated with vaginitis, particularly in the form of yeast infections or candidiasis. This organism is part of the normal flora of the vagina in many women but can overgrow under certain conditions, leading to symptoms like itching, irritation, and abnormal discharge. The infection can be precipitated by factors such as antibiotic use, hormonal changes, or immunosuppression.

In contrast, the other options presented are associated with different etiologies of vaginitis or infections that do not primarily involve yeast. Mycoplasma genitalium is a bacterium associated with sexually transmitted infections, while Trichomonas vaginalis is a protozoan that causes trichomoniasis, characterized by a different set of symptoms. Herpes simplex virus is a viral pathogen responsible for genital herpes, which also presents with distinct symptoms and clinical signs. Therefore, Candida albicans stands out as the specific yeast pathogen that causes vaginitis.