Answer the following question given this paragraph: 

A type of lipid called trans fat is found in many processed foods. Trans fat is rare in nature but is manufactured and added to foods to preserve freshness. Eating foods that contain trans fat increases the risk of heart disease. Trans fat may be found in such foods as cookies, doughnuts, crackers, fried foods, ground beef, and margarine.


Q: What is manufactured and added to foods to preserve freshness?

 Choices:

- carbohydrates

- vitamin c

- protein

- trans fat

A:
trans fat
