This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
The main function of Vitamin C in the body is 
Select and explain. 
A. Coenzyme for energy metabolism, B. Regulation of lipid synthesis, C. Involvement as antioxidant, D. Inhibition of cell growth
C: Involvement as antioxidant
Answer: C: Involvement as antioxidant 
Explanation: Vitamin C is one of a group of nutrients that includes vitamin E (see p. 391) and b-carotene (see p. 382), which are known as antioxidants. Consumption of diets rich in these compounds is associated with a decreased incidence of some chronic diseases, such as coronary hea disease and ceain cancers. However, clinical trials involving supplementation with the isolated antioxidants have failed to determine any convincing beneficial effects.Reference: Lippincott, Edition 5, page no: 378