5. The size order of $\tan 1, \sin 2, \tan 3$ is ( ).
A. $\sin 2<\tan 1<\tan 3$
B. $\tan 1>\sin 2>\tan 3$
C. $\sin 2>\tan 1>\tan 3$
D. $\tan 1<\tan 3<\sin 2$
5. B. Since $\tan 1>\tan \frac{\pi}{4} \geqslant 1>\sin 2>0$, and $\tan 3\sin 2>\tan 3$.