Final answer:
Option A, Mayonnaise, is not an example of a foam; it is an emulsion of oil in water, stabilized by egg yolk lecithins. The other options represent different forms of foam in food and beverages.
Step-by-step explanation:
The question asks to identify which option is not an example of a foam.
A foam is typically a colloidal substance where gas bubbles are trapped in a liquid or solid matrix. In this context:
- Mayonnaise is an emulsion of oil in water, not a foam. It is stabilized by egg yolk lecithins.
- A Latte involves steamed milk which creates a foam on the top of the beverage.
- Meringue is a foam made by whipping air into egg whites.
- Angel Food Cake is a foam that incorporates air bubbles into the batter before baking.
Therefore, the correct answer is A. Mayonnaise, as it is not an example of a foam but rather an emulsion.