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
Which of these is a poor source of Vitamin D? 
Select and explain. 
A. Fish fat, B. Whole milk, C. Cod liver oil, D. Egg
B: Whole milk
Answer: B: Whole milk 
Explanation: Food Vit D ug/ 100 g of food Butter 0.5-1.5 Egg 1 Whole milk 0.1 Fish fat 5-30 Cod liver oil 200-750 Halibut liver oil 500-10,000 Ref: Park's textbook of Preventive and Social Medicine, 21st edition, page-570