Which foods are included in a clear liquid diet?

The correct choice includes foods that are transparent and clear, which are the essential characteristics of a clear liquid diet. This diet primarily consists of liquids that are easily digestible and leave little residue in the digestive tract. Water and plain gelatin are prime examples; they provide hydration and a small amount of energy without requiring significant digestion.

A clear liquid diet is often prescribed before certain medical procedures or post-surgery to ensure the gastrointestinal tract is clear. Foods that would not be suitable, such as raw vegetables and fruits, whole grains, legumes, creamy soups, and dairy products, involve solid substances or opaque liquids that do not meet the requirements of being "clear." Therefore, the inclusion of water and plain gelatin aligns perfectly with the guidelines for this type of diet.