Identify the given number as "Rational", "Irrational", or "Not a real number". If the number is rational, give its exact value. If the number is irrational, give a decimal approximation to the nearest thousandth.
A. Rational, -15
B. Not a real number
C. Irrational, -112.500
D. Irrational, -15.000
Answer: B
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