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
A mother brought her six years old child to Eye OPD with history of night blindness. She told that the baby suffered from measles 6 months ago. Examination revealed corneal scarring. The doctor should suspect deficiency of 
Select and explain. 
A. Vitamin A, B. Vitamin D, C. Vitamin C, D. Vitamin B
A: Vitamin A
Answer: A: Vitamin A 
Explanation: None