24 Hours (1) (a.k.a. The Longest Day (1)) - S1-E1
Trivia: The first four episodes of the show all began the same way - with one of the doctors being awakened early in the morning from 'Exam 8' at the end of the hallway, in this order: Greene (Pilot), Lewis (Day One), Benton (Going Home), Carter (Hit and Run). Ross (George Clooney) was the only one of the original five who never slept in Exam 8.
Answer: Take care of your dad.