the correct answer was probably "neither".
Since some amplifiers need a specific input impedance, that is often something other than 50 ohms, you might have commented that if LOW NOISE FIGURE was of paramount importance, you would have tried to match the antenna to the reciever input using the optimal noise figure match impedance.
I would have mentioned that such a noise figure match might not be advised if it is a broadbandwidth receiver, where phase and amplitude ripple vs frequency was an issue, since a noise figure match is often a single frequency point match
you might have mentioned that a broadband 50 ohm match would be preferred if you needed to add a bandpass filter between the antenna and reciever front end, as often you need to do for interference reasons. for filters to work properly, they need a fixed source and load impedance, and are often designed for that impedance to be 50 ohms
In other words, answer in a way to shows you understand some of the potential issues with designing a good modern receiver front end.