Task: Wrong Candidate Generation
Input (English): Context: But ... The Tedster LOVED it when we brought out his special doggy birthday cake . He could n't get enough ! Grandma came over and a few friends and we sang him happy birthday . It was lovely . 
Question: Whose birthday was the narrator celebrating ? 
Correct Answer: They were celebrating a puppy 's birthday .
Output (English): They were celebrating their birthday .