Gonorrhea is a sex disease caused by:

Explanation

Gonorrhea is a sexually transmitted infection caused by the gram-negative bacterium Neisseria gonorrhoeae. This bacterium infects the mucous membranes of the reproductive tract, mouth, throat, eyes, and rectum. Option A is correct because it identifies the type of microorganism responsible for the infection. Option B is incorrect because viruses, such as the ones causing HIV or herpes, are not responsible for gonorrhea. Option C is incorrect as parasites cause different diseases, such as trichomoniasis. Option D is incorrect as it suggests none of the options are correct when, in fact, one is.