Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A mother-of-two was left disgusted after her six-year-old daughter found a human nail in her McDonald's burger. Lyn Richie, 38, had taken Ellyn, husband George, 41, and stepdaughter Katy, 12, to the fast food restaurant on Riverside Park East, Coleraine, Londonderry, for a family treat. But their meal was ruined when Ellyn lifted the bun off her Big Mac and spotted the nail sitting on top of the burger patty. Ms Richie, from Coleraine, reported the nail to a member of staff who confirmed it was human before offering her a refund for the family's £16.77 order. Child minder Ms Richie said: 'My six-year-old daughter was eating her Big Mac when she pointed to a foreign object sandwiched between the burgers.Mother-of-two Lyn Richie had taken family to McDonald's as a special treatBut their meal was ruined when daughter lifted burger bun and found nailMs Richie reported the discovery and restaurant is now being investigated 
 Question:A spokesperson for _ said: 'We are sorry for Ms Ritchie's experience when visiting our restaurant.

McDonald's