Odd Man Out

Each of the numbers except 257, is one less than the square of a certain number.

All except Afghanistan are SAARC members.

All except Crocodile are mammals, while crocodile is a reptile.

All except Alzheimer’s disease are psychological disorders.

All others are units for measuring weights.

5720 → 5+2+0 = 7 (Second digit from Right) 6710 → 6+1+0 = 7 (Second digit from Right) 2640 → 2+4+0 = 6 (Second digit from Right) 4270 → 4+7+0 = 11 ( Not the second digit from Right)

All options except Raisin are related to rain or water.

In all other pairs, second is a part of the first.

All except Lord Tennyson were either the Governor-General or the Viceroy of India.

All except Whale are sea-fishes, while whale is a mammal.