For this chain-of-thought reasoning and answer, what was the question?
Green grass does not imply only a back yard but could be any grassy area.
 A: it is not possible to tell
Q: Premise: "A black dog and a brown dog are playing rough on green grass."
Based on this premise, can we conclude that the hypothesis "The dogs played in the back yard." is true?
Options:
- yes
- it is not possible to tell
- no