This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
Reduced blink reflex occurs in all except 
Select and explain. 
A. Alcohol intoxication, B. Parkinsonism, C. Progressive supranuclear palsy, D. Myasthenia gravis
D: Myasthenia gravis
Answer: D: Myasthenia gravis 
Explanation: Clinical Significance Peripherally, damage to either the trigeminal nerve (V) or facial nerve (VII) nerve will disrupt the corneal blink circuit. ... Facial nerve damage causes ipsilateral paresis of the muscles of facial expression. ... Central nervous system dysfunction will cause deficits in the blink reflex bilaterally The corneal reflex may be slowed in various disorders affecting the trigeminal nerve, ganglion, or brain stem nuclei; these include posterior fossa and cerebellopontine angle tumors, Parkinsonism, progressive Supra nuclear palsy multiples sclerosis, , and brain stem strokes (especially Wallenberg's syndrome) Ref Harrison20th edition pg 2756