This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Fish liver oil is the richest source of: September 2006 
Select and explain. 
A. Vitamin K, B. Vitamin E, C. Vitamin D, D. Vitamin A
D: Vitamin A
Answer: D: Vitamin A 
Explanation: Ans. D: Vitamin A Fish liver oil is the richest source of vitamin A, but they are used as nutritional supplements rather than as food sources.