This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Motility, Subject name: Ophthalmology
Sixth cranial nerve palsy causes of left eye causes? 
Select and explain. 
A. Accomodation paresis in left gaze, B. Ptosis of left eye, C. Adduction weakness of left eye, D. Diplopia in left gaze
D: Diplopia in left gaze
Answer: D: Diplopia in left gaze 
Explanation: Ans. is 'd' i.e., Diplopia in left gaze o Sixth nerve supplies lateral rectus, therefore its palsy results in abduction weakness (not adduction weakness)o In left gaze, there is abduction of left eye and adduction of right eye. If there is paralysis of lateral rectus of left eye (6th nerve paralysis), abduction of left eye will not be possible in left gaze, while adduction of right eye is normal. Therefore, there will be diplopia in left gaze.