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: Surgery
[{'content': 'Commonest site of meningomyelocele is : \nSelect and explain. \nA. Lumbosacral, B. Cranial, C. Thoracic, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Myelomeningocele can occur at any spinal level but usually is seen between levels T12 and S2. Because neural tissue fails to form properly, the child is paraplegic and insensate below the level of the dysraphism. The clinical determination of neurologic level is most easily accomplished by describing the last muscles contracting under active voluntary motor control. Ref : Rab G.T. (2006). Chapter 11. Pediatric Ohopedic Surgery. In H.B. Skinner (Ed), CURRENT Diagnosis & Treatment in Ohopedics, 4e', 'role': 'assistant'}]