user
A dad and his son are driving around, suddenly the car crashes and the dad instinly the son is rushed to the hospital, when the son is in the emergency/operation room the doctor says i can't opeterate on him, he's my son.  Who was the doctor?
A: his mom
B: fatherland
C: patients
D: expert
E: pace car
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

A

<|end_of_solution|>