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
Richest source of vitamin D is: September 2003 
Select and explain. 
A. Fish, B. Soyabean, C. Halibut liver oil, D. Vegetables
C: Halibut liver oil
Answer: C: Halibut liver oil 
Explanation: Ans. C i.e. Halibut liver