This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular motility and squint, Subject name: Ophthalmology
[{'content': 'Positive forced duction test is seen in- \nSelect and explain. \nA. Extraocular muscle palsy, B. Mechanical restriction of ocular movement, C. Concomitant squit, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Forced Duction Test is performed to differentiate between the incomitant squint due to paralysis of extraocular muscle and that due to mechanical restriction of ocular movements. Positive Forced Duction Test (i.e., a restriction is encountered on passive rotation) is seen in cases of mechanical restriction of ocular movements. FDT is negative in cases of extraocular muscle palsy. Ref; A.K.Khurana ; 6th Edition ; Page no : 356', 'role': 'assistant'}]