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
Vit. A deficiency is characterized by – a)  Bitot's spotb)  Xerophthalmiac)  Night blindnessd)  Tranta's spot 
Select and explain. 
A. abc, B. bc, C. acd, D. bcd
A: abc
Answer: A: abc 
Explanation: None