question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: As shown in the figure, AB is the diameter of ⊙O, point D is on the extended line of AB, passing point D is the tangent of ⊙O, and the tangent point is C, if ∠A = 25.0, then ∠D = ()
  Choices:
  (A) 25°
  (B) 40°
  (C) 50°
  (D) 65°