In a given year, the expected inflation rate is 6% and the nominal interest rate is 10%, then which of the following items is the closest answer to the real interest rate（）.

In a given year, the expected inflation rate is 6% and the nominal interest rate is 10%, then which of the following items is the closest answer to the real interest rate（）.
A.4%
B.16%
C.10%
D.6%
正确答案：4%