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
Relative afferent pathway defect is manifested by which of the following pupil appearance: 
Select and explain. 
A. Argyll Robeson pupil, B. Hutchinson's pupil, C. Adies pupil, D. Marcus Gunn Pupil
D: Marcus Gunn Pupil
Answer: D: Marcus Gunn Pupil 
Explanation: Marcus Gunn pupil: It is the paradoxical response to a pppiLoLligbt in the presence ofa relative afferent path.'ay defect (RAPD.. It is tested by swinging flash light test. Argyll Robeson pupil: In this condition light reflex is absent while near reflex is present. Both the pupils are small in size, irregular and dilate poorly with mydriatics. It is seen in the lesions of tectum regions. Tonic pupil : A unilateral condition in which reaction to light is absent and to near reflex is very slow and tonic. The affected pupil is larger. Hutchinson' s pupil: It is a ocular sign of head injury. It is associated with subdural hemorrhage and unconsciousness.