This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stroke and TIA, Subject name: Medicine
Loss of upward gaze (sun setting sign) is seen in ? 
Select and explain. 
A. Perinaud syndrome, B. Weber syndrome, C. Millard gubler, D. Anton's syndrome
A: Perinaud syndrome
Answer: A: Perinaud syndrome 
Explanation: Perinaud syndrome: D/t compressive lesion of dorsal midbrain(Superior colliculus and Edinger Westphal nucleus)-->impaired motor function of the eye. Triad of perinaud syndrome: Upgaze paralysis Convergence retraction nystagmus Pupillary light-near dissociation. Anton's syndrome: Visual anosognosia associated with confabulation in the setting of obvious visual loss and coical blindness Due to B/L occlusion of distal branches of PCA. Weber's syndrome: Presence of an ipsilateral oculomotor nerve palsy and contralateral hemiparesis or hemiplegia Due to occlusion of P1 PCA Millard Gubler syndrome: Characteristically seen with Pontine stroke. I/L 6th N. palsy- Diplopia on looking laterally I/L 7th N. palsy- facial paralysis but sensations not affected Coicospinal tract damage in pons will lead to C/L hemiplegia in arms and legs