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Transformers - Technical MCQs

Q1:

What is the turns ratio of the transformer needed to match a 1 komega.gif source resistance to a 160 omega.gif load?

A 2.5:1

B 0.4:1

C 6.25:1

D 16:1

ANS:B - 0.4:1

0.4:1 is for (Ns/Np)^2 = Zs/Zp.
2.5:1 is for (Np/Ns)^2 = Zp/Zs.

I think that both of them are correct, the only mistake is putting both of them in the choices that is why it got a little confusing.