Discussion
Assertion (A): Feeder cells are treated so that they cannot divide.
Reason (R): Otherwise they would overgrow the cells of interest that they are meant to support.
Answer: B
Both are true and the reason gives the necessity: the layer must persist and secrete without competing, so irradiation or a drug is used to stop its division while leaving it metabolically active. The layer supports without competing, which is exactly what is wanted.
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