**Question:** In trichomonas vaginalis:

A. Infects only male genitalia
B. Is a common cause of bacterial vaginosis
C. Causes inflammation of the cervix
D. Occurs due to poor hygiene

**Core Concept:** Trichomonas vaginalis is a parasitic protozoan that can cause trichomoniasis, an infection affecting the genital tract in both males and females.

**Why the Correct Answer is Right:** Trichomonas vaginalis is an important pathogen that targets the genital tract in both sexes, affecting the female urethra, cervix, and vagina. In females, the infection is commonly associated with symptoms such as vaginal discharge, itching, and burning sensation. In males, it can lead to urethritis, epididymitis, and epididymo-orchitis. The infection is sexually transmitted and is not limited to males.

**Why Each Wrong Option is Incorrect:**

A. Infects only male genitalia: This is incorrect because trichomoniasis can affect both males and females.

B. Is a common cause of bacterial vaginosis: While trichomoniasis can co-exist with bacterial vaginosis, it is not the primary cause. Bacterial vaginosis is a condition characterized by a change in the vaginal flora, which can result in secondary infection with Trichomonas vaginalis.

C. Causes inflammation of the cervix: While trichomoniasis can cause inflammation in the female genital tract, it is not limited to the cervix. The infection affects the vagina, cervix, and urethra.

D. Occurs due to poor hygiene: Trichomoniasis is primarily transmitted sexually, not solely due to poor hygiene. Good hygiene alone is not a risk factor for acquiring the infection.

**Clinical Pearl:** Trichomoniasis is a sexually transmitted infection that affects the genital tract of both males and females. While it can coexist with other genital infections, it is not responsible for causing bacterial vaginosis or cervix inflammation. Proper sexual transmission, not poor hygiene, is the primary risk factor for acquiring trichomoniasis.