Detailed Instructions: 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].
Problem:A Japanese man has become a viral sensation after he was captured going for a walk with his enormous pet tortoise. Funeral director Mitani Hisao has owned the tortoise for 19 years after he purchased it from a Tokyo pet shop to take the place of the child he never had. The 62-year-old named the tortoise Bon-chan and watched over it as it grew from five to 75cm in diameter. Mitani said: ‘I never had any children, but 19 years ago my wife caught the eyes of this little tortoise and felt an instant bond with him. I couldn't leave the store without it.Mitani Hisao has owned the tortoise for 19 years after buying it in TokyoThe tortoise has grown from five to 75cm in diameter under Mitani's watchNamed Bon-chan, the creature accompanies Mitani on walks around cityThe 62-year-old said that the tortoise took the place of child he never had 
 Question:Despite the reputation of the tortoise being a slow and methodical creature, Mitani claims that _-chan is actually pretty quick.
Solution:
Bon