This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CT SCAN, Subject name: Radiology
Calcification of Posterior Longitudnal Ligament is best diagnosed by 
Select and explain. 
A. X-Ray, B. CT, C. MRI, D. PET
B: CT
Answer: B: CT 
Explanation: * Calcifications are best seen on CT Scan images. * Calcification of Posterior Longitudnal Ligament is (OPLL) Ossified Posterior Longitudnal Ligament and was traditionally considered more frequent in Japan and common in cervical spine Figure: Illustration of OPLL Figure: OPLL On plain film Figure: OPLL on sagittal CT scan Calcification of Posterior Longitudnal Ligament is also known as Japan's Disease.