Task: Question Answering
Input (English): Question: The arithmetic mean of the set S = {4, K, 3, 9, M, 4} is 5. If K and M are integers, and K ≠ M, what is the median of the numbers in the set?

 Option A: 3

 Option B: 3.5

 Option C: 4

 Option D: 4.5

 Option E: 5
Output (English): Option C