A badly worded question I think.

If the wording is intended to say that all four sides are equal, then the answer will be a rhombus.

If however the two pairs have a side in common so that three sides are the same length, then the fourth is not defined, and then answer would be a quadrilateral.

Also, if one pair of sides is of a different length to the other pair, again the answer will be a quadrilateral.