The example of an unsaturated fatty acid among the options provided is corn oil. Here's why:
1. Unsaturated fatty acids have one or more double bonds between carbon atoms in their hydrocarbon chain.
2. Corn oil is known to be high in unsaturated fats, particularly containing monounsaturated and polyunsaturated fatty acids.
3. Coconut oil and palm oil, on the other hand, are examples of saturated fats as they consist mainly of saturated fatty acids without double bonds.
4. Plant sterols are a type of compound found in plants that resemble the chemical structure of cholesterol, but they are not fatty acids.
Therefore, out of the options given, corn oil is the example of an unsaturated fatty acid.
