Task: Question Answering
Input (English): Question: The function f is defined by subtracting 25 from the square of a number and the function d is defined as the square root of one-half of a number. If d(f(x))=10, then which of the following is a possible value of x?

 Option A: -15

 Option B: -5

 Option C: 0

 Option D: 5

 Option E: 25
Output (English): Option A