Which of the following is a true statement about a tangent and a radius?

A. A tangent and a radius of a hexagon are always equal lengths.
B. A tangent and a radius of a circle meet to form a 90 angle.
C. A tangent and a radius in a cylinder form two legs of a right triangle with the cylinders altitude serving as the hypotenuse.
D. A tangent and a radius intersect at the foci of an ellipse.