Which common sexually transmitted infection is caused by Chlamydia trachomatis?

• A. Chlamydia
• B. Gonorrhea
• C. Syphilis
• D. Herpes

Answer: (A)

Chlamydia is the infection caused by Chlamydia trachomatis. This bacterium is the culprit behind one of the most common sexual infections, which is often silent or minimally symptomatic, making screening important. The other options are caused by different pathogens: gonorrhea by Neisseria gonorrhoeae, syphilis by Treponema pallidum, and herpes by herpes simplex virus. Because the disease name directly reflects the causative organism, identifying chlamydia as being caused by Chlamydia trachomatis is the best match.