Step 1: Understanding emulsification.
- Lecithin is a phospholipid that acts as a natural emulsifier, stabilizing mixtures of oil and water.
Step 2: Explanation of incorrect options.
- Unsaturated fatty acids, steroids, and sphingosine do not have emulsifying properties.
Step 3: Selecting the correct option.
- Since lecithin functions as an emulsifier, the correct answer is (A) Lecithin.