GAUSS8 2002 Problem 14

Past Contests GAUSS8 GAUSS (GR. 8) - 2002
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1

In the diagram, \angle{ABD}=\angle{BDC} and \angle{DAB}=80^\circ. Also, AB=AD and DB=DC. The measure of \angle{BCD} is

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Answer Choices
A. 65^\circ
B. 50^\circ
C. 80^\circ
D. 60^\circ
E. 70^\circ