AMC8 2000 Problem 13

In triangle C A T, we have \angle A C T=\angle A T C and \angle C A T=36^{\circ}. If \overline{T R} bisects \angle A T C, then \angle C R T=?
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Answer Choices
A. 16^{\circ}
B. 51^{\circ}
C. 72^{\circ}
D. 90^{\circ}
E. 108^{\circ}