Discussion
Assertion (A): A cancer cell may produce the very growth factor it responds to.
Reason (R): Autocrine signalling frees a cell from depending on signals made by other cells.
Answer: D
Both are true and the reason gives the advantage to the tumour: self-sufficiency in growth signalling is one of the recognised hallmarks of cancer, and autocrine loops are one route to it. Independence from external growth signals is what the loop buys.
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