In the diagram, a semi-circle has centre O and diameter A C. Also, B is a point on the circumference such that \angle B A C=25^{\circ}.
The measure of \angle B O C is
Answer Choices
A. 60^{\circ}
B. 55^{\circ}
C. 45^{\circ}
D. 50^{\circ}
E. 65^{\circ}