Why do evaluators ask you this question?
They would like to know which other institutes you got calls from. For example, if you are appearing for the interview of XLRI but you have received calls from all the IIMs it means that you have good analytical skills since you cleared the written exams of IIMs.
Evaluators would like to know how much you know about different institutes - whether you could rank them in the order of preference.
Evaluators would like to know how honest you are. You should never lie that you would join a lower ranked college even if you were selected in a higher ranked college - in that case, you would be obviously telling a lie and evaluators would not like it.
They want to know the criteria you use to evaluate institutes.