Read the following introduction: "Do you prefer chocolate or strawberry milk to regular milk? If so, you need to be aware that some educators and health experts want to stop school cafeterias from providing chocolate or other-flavored milk to students. The article “Chocolate Milk in School Cafeterias?” explains that this group of people are concerned that the extra sugar added to chocolate milk, or other flavored milk, is unhealthy. While excess sugar is certainly unhealthy, it would be unwise to take chocolate milk out of cafeterias."
What is the hook?