This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
Richest source of Vitamin D is - 
Select and explain. 
A. Milk, B. Egg, C. Green leafy ve getables, D. Fish oil
D: Fish oil
Answer: D: Fish oil 
Explanation: - vitamin D is unique because it is derived both from sunlight and foods. - vitamin D is necessary for the functions of bone, kidney and intestine. - the richest source of vitamin D is cod liver oil (200-750mcg per 100g) and other fish oils. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:617 <\p>