Moderate

Graft versus host reaction is caused by_________________?

Correct answer: B. T-lymphocytes

  • A. B-Lymphocytes
  • B. T-lymphocytes
  • C. Monocytes
  • D. Leukocytes

Explanation

Graft-versus-host disease occurs when immunocompetent donor T lymphocytes attack the recipient's tissues after transplantation. B lymphocytes produce antibodies but are not the primary mediators of this reaction.

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