This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro Ophthalmology, Subject name: Ophthalmology
A lady in her first trimester with hyperemesis gravidarum wakes up with diplopia and mental confusion and nystagmus. What is the probable diagnosis? 
Select and explain. 
A. Pregnancy induced hypeension, B. Wernicke's syndrome, C. Occipital infarction, D. Pituitary apoplexy
B: Wernicke's syndrome
Answer: B: Wernicke's syndrome 
Explanation: Wernicke's encephalopathy (WE) is a potentially reversible yet serious neurological manifestation caused by vitamin B1(thiamine) deficiency. It is commonly associated with heavy alcohol consumption. Other clinical associations are with hyperemesis gravidarum (HG), starvation, and prolonged intravenous feeding. Most patients present with the triad of ocular signs, ataxia, and confusion, nystagmus It can be associated with life-threatening complication like central pontine myelinolysis (CPM).