This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'A patient has a right homonymous hemianopia with saccadic pursuit movements and defective optokinetic nystagmus. The lesion is most likely to be in the \nSelect and explain. \nA. Frontal lobe, B. Occipital lobe, C. Parietal lobe, D. Temporal lobe', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Right nomonymous hemianopia with saccadic pursuit movements and detective optokinetic nystagmus confirms the diagnosis of perietal lobe lesion.\nOptokinetic Nystagmus: - It can be elicited in all normal individuals.\nDefect in optokinetic nystagmus and lesions of brain associated with it.\nIn a case of hemianopia due to lesions of the parietal lobe optokinetic nystagmus is absent.\nOther lesions where optokinetic Nystagmus is defective:-\n\nFrontal lobe lesions - it inhibits this response only temporarily.\nBrainstem lesions - it results in asymmetry of this response in vertical plane.', 'role': 'assistant'}]