X-rays cannot detect;

Explanation

All of these options are correct. X-rays cannot detect sugar, blood pressure, or cholesterol. These are all substances that are not dense enough to block X-rays. X-rays are best at detecting dense materials, such as bones, metal, and some types of cancer. X-rays are a type of electromagnetic radiation that can pass through most materials. However, the amount of X-rays that are blocked by a material depends on the density of the material. Dense materials, such as bones, block more X-rays than less dense materials, such as air. Sugar, blood pressure, and cholesterol are all relatively low-density substances. This means that they do not block X-rays very well. As a result, X-rays cannot be used to detect these substances.