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Which of the following is an example of a live attenuated vaccine?

  • A. Hepatitis B vaccine
  • B. Inactivated polio vaccine
  • C. Measles, Mumps, Rubella (MMR) vaccine
  • D. Diphtheria, Tetanus, Pertussis (DPT) vaccine
Correct Answer: C

Rationale: The correct answer is C: Measles, Mumps, Rubella (MMR) vaccine. Live attenuated vaccines contain weakened forms of the virus. MMR vaccine is made from weakened live viruses of measles, mumps, and rubella. When administered, the body develops an immune response without causing the disease. Choice A, Hepatitis B vaccine, is a subunit vaccine. Choice B, Inactivated polio vaccine, is a killed virus vaccine. Choice D, Diphtheria, Tetanus, Pertussis (DPT) vaccine, is a toxoid vaccine. Live attenuated vaccines provide stronger and longer-lasting immunity as they mimic natural infection without causing illness.