This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
Richest source of Vitamin D is 
Select and explain. 
A. Milk, B. Fish liver oils, C. Sunlight, D. Carrots
B: Fish liver oils
Answer: B: Fish liver oils 
Explanation: Sources of vitamin D: Fish, egg yolk, liver, butter, cheese. Sunlight is also a good source of Vitamin D but upto 50% of the world population is not exposed to sunlight i.e. due to lack of sunlight in some countries and even due to more work load indoors. So this cannot be considered as richest source of Vitamin D. EXTRA READING ON TOPIC (Vitamin D): Active moiety: Calcitriol Main biochemical role: Calcium and Phosphate absorption from intestine and their reabsorption from kidneys. Deficiency: Rickets in children, Osteomalacia in adults, Osteoporosis in elderly