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
[{'content': 'Locked-in state is characterized by - \nSelect and explain. \nA. Paralysis of all voluntary muscles with unconsciousness, B. Paralysis of all voluntary muscles except ocular muscles, C. Injury to medulla, D. Loss of cognitive function', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Paralysis of all voluntary muscles except ocular muscleso Locked-in syndrome is caused by damage to pons, especially ventral pons.o It may be due to infarct, hemorrhage or trauma.o There is Quadriplegia, lower cranial nerve palsies, and mutism with preservation of consciousness.o Vertical gaze and upper eyelid movements are preserved.o Cognitive function is intact.", 'role': 'assistant'}]