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: Ophthalmology
In colour perimetry the smallest field of vision is with: 
Select and explain. 
A. Green object, B. Blue object, C. Yellow object, D. Red object
A: Green object
Answer: A: Green object 
Explanation: Ans. Green object