Who is Canada's current Prime Minister as of October 2023?

The correct answer is Justin Trudeau, who has been serving as Canada’s Prime Minister since November 4, 2015. As the leader of the Liberal Party, Trudeau has been a significant figure in Canadian politics, known for his focus on progressive policies, diversity, and climate change initiatives.

Trudeau's lasting position in office makes him a prominent and recognizable figure associated with Canada’s current political landscape as of October 2023. The other names listed do not relate to the current Prime Minister; Jacques Parizeau and Paul Martin are former leaders who held different positions at earlier times in Canada's history, while "Trudeau Jr." is an informal reference and not a recognized title. The accurate, formal title reflects his full name and ensures clarity in identifying him as the current leader of the country.