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
Investigation of choice for meningeal carcinomatosis in CNS: 
Select and explain. 
A. NE-CT, B. PET, C. SPECT, D. Gd-MRI
D: Gd-MRI
Answer: D: Gd-MRI 
Explanation: D i.e. Gd-MRI Investigation of choice for meningeal carcinomatosis is Gd enhanced MRIQ (especially for detection of focal spread, bulky disease and metastases from solid tumor). Demonstration of tumor cells/tumor markers in CSF is definitive & often considered gold standard; but has suboptimal/moderate overall sensitivity, and is more sensitive in detecting diffuse leptomeningeal involvement from hematological malignancy