In this task, you're given a context passage. Your job is to generate relevant questions that can be answered by directly referring to the passage.

Let me give you an example: Tracy slept awkwardly on their new bed and was having some pain, so Tracy cracked her neck.
The answer to this example can be: What did Tracy do with her neck?
Here is why: The question asked is relevant and can be directly answered by referring to the phrase "so Tracy cracked her neck" from the passage.

OK. solve this:
I love to make hot chocolate in the wintertime. Today it snowed so I decided to make myself a mug of hot cocoa. Some people just put a mug of water in the microwave and then add Swiss Miss. Not me. I use milk in mine. First I put the milk in a sauce pan. Then I put it on the burner on medium high heat. While the milk is heating up I get mix cocoa and sugar together. I have to be careful while boiling milk because once I did it for too long. Then a skin formed on top and it was gross. I learned after that that as soon as it boils I need to pull it off the burner.Once the milk comes to a boil I pour it into a mug. Then I add the cocoa. Then I stir and enjoy it in front of my fireplace.
Answer:
Why did they want the milk boiled?