[Q]: Sentence: The International Association for the Study of Pain's widely used definition states: "Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage. Question: Why has defining pain been a challenge? OPTIONS:
- yes
- no
++++++++++
[A]: no

[Q]: Sentence: Darwin noted that barriers to migration played an important role in the differences between the species of different regions. Question: What was the combination of effects that Darwin considered the most important in determining the differences in species that evolved separately in similar environments? OPTIONS:
- yes
- no
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[A]: no

[Q]: Sentence: Special bundles of the game contain a Wolf Link Amiibo figurine, which unlocks a Wii U-exclusive dungeon called the "Cave of Shadows" and can carry data over to the upcoming 2016 Zelda game. Question: What is the level called that the special Amiibo will unlock? OPTIONS:
- yes
- no
++++++++++
[A]:
yes