Q

_____ is described in the source as the most intelligent mammal on Earth.

RRB NTPC (Stage-I) 27/04/2016 2016
✓ Answer: A Dolphin
The source selects dolphin. Dolphins show complex cognition, but 'most intelligent mammal' has no single scientifically established ranking. The shift label is cut off or unreadable in the source; only the date is recorded.
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