Correct Answer: Lion : Cub

Solution : Given:
Human : Child :: ? (This depicts the relationship between a living thing and its young stage).

Let's check each option –
First option: Lion : Cub; the baby of the lion is called a cub.
Second option: Cow : Bull; a cow is a female cattle, and a bull is a male cattle.
Third option: Duck : Drake; a drake is the male counterpart to a duck.
Fourth option: Fish : Prawn; a prawn is a type of crustacean, not a fish.

So, only the first option follows the same pattern as followed by the given pair. Hence, the first option is correct.