This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Interstitial Lung Disease, Subject name: Medicine
Opsoclonus is a feature of? 
Select and explain. 
A. Carcinoma lung, B. Retinoblastoma, C. Focal seizure with dyscognitive changes, D. Extrapyramidal damage in Wilson disease
A: Carcinoma lung
Answer: A: Carcinoma lung 
Explanation: Opsoclonus - Involuntary jerky movement of eye - Disordered eye movement involuntary chaotic saccades in all direction of gaze Lesion Fastigial nucleus in cerebellum Leading cause of opsoclonus in Adult population is Carcinoma lung / breast Carcinoma In Pediatric- Neuroblastoma