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: Medicine
A child is exclusively fed on cow's milk. the  deficiency seen in 
Select and explain. 
A. Iron, B. Vitamin A, C. Thiamine, D. Riboflavin
A: Iron
Answer: A: Iron 
Explanation: Cow's milk is a poor source of vitamin C and Iron.