GREY’S ANATOMY – “Moment of Truth” – After eight years of practice, the residents head to San Francisco for their oral boards; sparks fly between Catherine and Richard when they bump into each other at the hotel; Bailey intervenes after Owen and Teddy get into a heated argument about their young car crash patient; and Mark tries to recruit Lexie for one of his cases. Meanwhile, Alex feels guilty for being away from the hospital when Tommy’s health begins to fail, on Grey’s Anatomy, THURSDAY, APRIL 26 (9:00-10:01 p.m., ET)