In this question, we are given two lists - List I and List II. List I contains different types of molecules, while List II contains the products of digestion. Our task is to match the correct product from List II with the corresponding molecule from List I.

1. Proteins - Proteins are digested into amino acids. Therefore, the correct product of protein digestion is amino acids.

2. Carbohydrates - Carbohydrates are digested into monosaccharides. Therefore, the correct product of carbohydrate digestion is monosaccharides.

3. Nucleic acids - Nucleic acids are digested into nitrogenous bases and pentose sugars. Therefore, the correct product of nucleic acid digestion is nitrogenous bases and pentose sugars.

4. Lipids - Lipids are digested into fatty acids and glycerol. Therefore, the correct product of lipid digestion is fatty acids and glycerol.

Looking at the options, we can see that Option 4 has the correct matching of products to their respective molecules. Therefore, the correct answer is option 4.

Note: The provided answer is generally correct and matches the correct pairings of products and molecules.