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: Radiology
[{'content': 'Investigation which should not be done in a patient with brain tumor: \nSelect and explain. \nA. CT Scan, B. Lumber Puncture, C. MRI, D. X - Ray', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Lumber puncture Raised ICT (example in Brain Tumor) is an absolute contraindication for L.P. as there is risk of brain herniation & sudden death.Q', 'role': 'assistant'}]