Which of the following is considered high in cholesterol?

The egg yolk is considered high in cholesterol because it contains a significant amount of this substance, which is essential for various bodily functions, including hormone production and cell membrane integrity. In contrast, egg whites contain very little to no cholesterol, making them a healthier option for those concerned about their cholesterol intake. Additionally, vegetable oils and plant-based foods generally do not contain cholesterol at all, as cholesterol is primarily found in animal products. Therefore, the egg yolk stands out as the food item that is high in cholesterol, which is why it is the correct answer in this context.