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To evaluate the expression \(\sqrt{169 - 25}\):
1. First, calculate \(169 - 25\):
\[
169 - 25 = 144
\]
2. Next, take the square root of \(144\):
\[
\sqrt{144} = 12
\]
Thus, the expression is a real number.
The correct choice is:
A. The expression is a real number. \(169 - 25 = 144\) (And the answer is \(12\)).