Q. Consider the following diseases/pathogens:
I. Gonorrhea
II. Tuberculosis
III. Hepatitis B
IV. Human Immunodeficiency Virus (HIV)
V. Syphilis
How many of the above are classified as Sexually Transmitted Infections (STIs)?

[A] Only two

[B] Only three

[C] Only four

[D] All the five

Answer: C
Notes:

Explanation:

  • Gonorrhea, Hepatitis B, HIV, and Syphilis (not in the list but implied in STIs) are all STIs.
  • Tuberculosis (II) is an airborne respiratory disease spread through droplets and is not classified as an STI.
  • Note: Pyelonephritis (from your original list) is a kidney infection, usually a complication of a UTI, not primarily an STI.
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