One question, one monk, but three directions

Question: You are walking down the road trying to find enlightenment when you come to a monk and a three-way fork in the road. The roads point North, East, and West. You can ask the monk one question. He will answer honestly yes, no, or just hum if he cannot answer the question.

What do you ask him to figure out the correct path?

Question: What is that thing we buy for eating but cannot eat it?

Question: You build a house and all 4 walls are facing south. Where did you build the house?

Question: A girl dove in the sea.. some say there are two people under the sea. Why is that?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?