On the basis of the logic used in the first pair, select from the substitute alternate question mark in the second pair.

Parrot : beak :: Elephant : ??

In this analogy, the first term "Parrot" is related to its characteristic feature "beak", which is a physical attribute of the parrot. Similarly, the second term "Elephant" should be related to a physical attribute of the elephant.

Option 1 "Small" does not fit the analogy as it does not relate to any physical characteristic of the elephant.

Option 2 "Chair" is also not relevant as it is not a characteristic feature of an elephant.

Option 3 "Tusk" is the correct answer as it is a physical characteristic of an elephant, just like a beak is a characteristic feature of a parrot. Elephants are known for their long, curved tusks made of ivory, which they use for various purposes such as digging, defense, and foraging.

Option 4 "Book" is not related to elephants in any way and can be eliminated as a potential answer.

Hence, the correct answer is option 3 - Tusk.