This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: ENT
[{'content': 'Where will be the placement location for Auditory Brainstem Implant? \nSelect and explain. \nA. Scala tympani, B. Recess of 4th ventricle, C. IAC, D. back of ear', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The implant is usually placed in the lateral recess of the fouh ventricle at the time of tumor resection to stimulate the cochlear nucleus Auditory Brainstem Implant (ABI): * Tumor resection surgery in NF patients result in cochlear nerve damage or loss of function of nerve resulting in deafness. * ABI are useful in restoring auditory perception to deaf patients with neurofibromatosis type 2 (NF2) * Also used in treatment of congenitally deaf children with cochlear malformations or cochlear nerve deficiencies. * Placement location: Lateral recess of 4th ventricle REF : HAZARIKA 4TH ED', 'role': 'assistant'}]