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
[{'content': 'The only intact eye movement in one and a half syndrome is \nSelect and explain. \nA. Abduction of Ipsilateral eye, B. Abduction of contralateral eye, C. Adduction of Ipsilateral eye, D. Adduction of contralateral eye', 'role': 'user'}, {'content': 'Answer: B \nExplanation: One-and-a-half syndrome is due to a lesion of MLF combined with PPRF of same side. Loss of all horizontal movements except contralateral abduction, which shows abduction nystagmus. One and One half syndrome (right sided lesion) Eight and half syndrome consists of one and half syndrome with 7th nerve palsy.', 'role': 'assistant'}]