The correct option is Two.
Explanation
Sexually Transmitted Infections (STIs) are caused by a variety of pathogens, primarily bacteria, viruses, and parasites. Distinguishing the causative agent is essential as it determines the treatment approach; bacterial STIs are typically treated with antibiotics, while viral STIs are managed with antivirals or symptom-based treatments.
Analysis of the Listed Infections:
- Gonorrhoea: This is a bacterial infection caused by Neisseria gonorrhoeae. It primarily affects the mucous membranes of the reproductive tract.
- Syphilis: This is a bacterial infection caused by the bacterium Treponema pallidum. It is characterized by distinct stages of progression if left untreated.
- Warts (Genital Warts): These are viral infections caused by the Human Papillomavirus (HPV).
- HIV-AIDS: This is a viral infection caused by the Human Immunodeficiency Virus (HIV), which attacks the body's immune system.
Thus, only two of the listed infections (Gonorrhoea and Syphilis) are bacterial in origin.
Key Takeaway: Gonorrhoea, Syphilis, and Chlamydiasis are major bacterial STIs. HIV-AIDS, Genital Herpes, Genital Warts, and Hepatitis B are major viral STIs.