In this task, you are given a sentence. You must find the primary subject in the supplied sentence. The output must be a sub-sequence in the sentence.
Example: Rope and its Usage
Example solution: Rope
Example explanation: The word 'Rope' is the key subject here, while Usage is a property of Rope.

Problem: It is grown in Kenya, Tanganyika, Haiti and Java and, when new and untreated, is hairy and of a pale straw colour.
Solution: It