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Assertion (A): Serum-free media are preferred for experiments that must be reproducible.
Reason (R): The composition of animal serum varies from batch to batch.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the difficulty: an undefined and variable ingredient makes it hard to attribute a result to the treatment rather than to the medium, so a defined formulation removes one source of doubt.

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