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Cosider the non-constant differentiable function f of one variable which obeys the relation `(f(x))/(f(y))=f(x-y)`. If `f'(0)=p` and `f'(5)=q`, then `f'(-5)` is

A

`(p^2)/(q)`

B

`(q)/(p)`

C

`(p)/(q)`

D

q

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