Who makes your choices?

Following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

Question: Sir, in the previous discourse you mentioned that one should always choose ‘That,’ instead of money, or fame, or other worldly things. But who is the one who makes this choice? Is that the same ‘I’, that same ego that makes choice? Can it ever make choice against itself? What is that part of us that makes this choice?