Match the nutrients in Column I with their description from Column II.

Column I	Column II
1. Leucine	A. Essential fatty acid
2. Aspartic acid	B. Non-essential amino acid
3. Linoleic acid	C. Saturated fatty acid
4. Butyric acid	D. Essential amino acid

Options:

Correct option is D

Leucine is an essential amino acid, meaning it cannot be synthesized by the human body and must be supplied through diet. It plays a key role in muscle protein synthesis, tissue repair, and energy regulation. Hence, 1 → D.
Aspartic acid is a non-essential amino acid, because the body can synthesize it internally. It is important in the urea cycle, gluconeogenesis, and neurotransmission, but since it is not required from diet, it is classified as non-essential. Hence, 2 → B.
Linoleic acid is an essential fatty acid belonging to the omega-6 family. The body cannot produce it, and it is required for cell membrane function, growth, and synthesis of eicosanoids. It must be obtained from oils like sunflower, soybean, and safflower oil. Hence, 3 → A.
Butyric acid is a short-chain saturated fatty acid, commonly found in butter, dairy fats, and produced in the colon by microbial fermentation of dietary fiber. It supports gut health and colonocyte energy metabolism. Hence, 4 → C.
Thus, the correct matching is: 1-D, 2-B, 3-A, 4-C.