This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Spinal Injuries, Subject name: Orthopaedics
The X-ray below shows a patient with scoliosis. What is the angle to measure the severity of curve called as? 
Select and explain. 
A. Reisser's angle, B. Boston's angle, C. Cobb's angle, D. Milwaukee's angle
C: Cobb's angle
Answer: C: Cobb's angle 
Explanation: Ans. C. Cobb's angleCobb's angle is formed by a line drawn along the superior margin of the topmost vertebra and another line drawn along the lower margin of the bottom vertebra. Greater the angle, greater is the severity of the scoliotic curve.