What is the main duty of the prime minister?

What is the main duty of the prime minister?

The main duty of the prime minister is to choose and lead the Cabinet. The prime minister generally selects the Cabinet from among the members of his party in the House of Commons. It is a custom for every province to be represented in the Cabinet. When a particular province is not represented in the Commons by a member of the party in power, the prime minister may appoint a senator to a Cabinet post.