Concept:
• Sexually Transmitted Infections (STIs): Also known as Venereal Diseases (VD), these are infections or diseases transmitted primarily through intimate sexual contact with an infected partner.
• Systemic and Respiratory Infections: Diseases that spread through pathways such as airborne droplets, contaminated food or water, or direct contact, rather than primarily via sexual intercourse.
Step 1: Analyze the transmission pathway of the listed diseases
• Genital warts (Option A): Caused by the Human Papillomavirus (HPV). It is a well-established viral STI spread primarily through sexual contact.
• Syphilis (Option B): Caused by the spirochete bacterium Treponema pallidum. It is a chronic infection transmitted through sexual contact with active lesions.
• Gonorrhoea (Option D): Caused by the bacterium Neisseria gonorrhoeae. It is a common bacterial STI affecting the mucosal surfaces of the urogenital tract.
Step 2: Analyze the transmission pathway of Tuberculosis
Tuberculosis (Option C): Caused by the bacterium Mycobacterium tuberculosis. It is primarily a pulmonary (lung) disease that spreads through airborne droplet transmission when an infected individual coughs, sneezes, or talks. It is not classified as a sexually transmitted infection. This corresponds to option (C).