Answer:B. trichomoniasis.
Explanation:Trichomonas is a single-celled protozoan parasite best known in medicine because one species causes vaginitis (vaginal inflammation). Infection with trichomonas (trichomoniasis) is the most common curable sexually transmitted disease (STD) in young sexually active women.) in young sexually active women.
Trichomoniasis is a sexually transmitted infection (STI) caused by the motile parasitic protozoan Trichomonas vaginalis.