Q. With reference to communicable diseases, which one of the following statements is correct?

[A] Tuberculosis is caused by a bacterium that strictly and exclusively affects the pulmonary system (lungs)

[B] Malaria is a viral infection transmitted to humans via the bite of an infected female Anopheles mosquito

[C] Polio is a viral disease that can invade the central nervous system, potentially resulting in total paralysis

[D] Dengue fever is transmitted to humans solely through the bite of the female Anopheles mosquito

Answer: C
Notes:

Explanation:

  • is incorrect: TB can affect other parts of the body (Extrapulmonary TB) like kidneys, spine, and brain.
  • (b) is incorrect: Malaria is protozoan, not viral.
  • (d) is incorrect: Dengue is transmitted by Aedes aegypti mosquitoes.
  • (c) is correct: The Polio virus attacks the nerve cells of the spinal cord.
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