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
Highest amount of vitamin D content among the following is seen in: 
Select and explain. 
A. Egg, B. milk, C. butter, D. cod liver oil
D: cod liver oil
Answer: D: cod liver oil 
Explanation: Dietary sources of vitamin D: DISINFECTANT Mg/100 g Egg 1.25-1.5 butterl 10.5-1.5 Milk 0.1 Cod liver oil 200-750 Halibut liver oil 500-10,000 Ref: Park 22nd edition, page 572