This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: obstetrics,pediatrics and geriatrics, Subject name: Social & Preventive Medicine
What is deficient in exclusively breast fed baby - 
Select and explain. 
A. Vitamin B, B. Vitamin A, C. Vitamin C, D. Proteins
A: Vitamin B
Answer: A: Vitamin B 
Explanation: Vitamin A is absent.The only vitamins present are vitamin C and D.REF.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE.Editon-21.Page no.-496