A circle is centered at O, \overline{A B} is a diameter and C is a point on the circle with \angle C O B=50^{\circ}. What is the degree measure of \angle C A B ?

**Answer Choices**

A. 20

B. 25

C. 45

D. 50

E. 65

A circle is centered at O, \overline{A B} is a diameter and C is a point on the circle with \angle C O B=50^{\circ}. What is the degree measure of \angle C A B ?

**Answer Choices**

A. 20

B. 25

C. 45

D. 50

E. 65