Task: Question Answering
Input (English): Question: Z is a set of positive numbers. The median of Z is greater than the mean of Z. Which of the following W must be true?
I. At least 50% of the numbers in Z are smaller than the median.
II. Less than 50% of the numbers in Z are greater than the median.
III. The median of Z is greater than the average of the largest and smallest numbers in Z.

 Option A: I only

 Option B: II only

 Option C: III only

 Option D: I and III only

 Option E: W=None of the above
Output (English): Option E