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
What constitutes a spinal motion segment? 
Select and explain. 
A. A disc and the facet joints at that level., B. A disc and the vertebrae above and below, including their interlocking facet joints., C. A section of the spine involved in a physiological curve with the similar function (i.e. thoracic kyphosis)., D. A vertebral body and the disc above.
B: A disc and the vertebrae above and below, including their interlocking facet joints.
Answer: B: A disc and the vertebrae above and below, including their interlocking facet joints. 
Explanation: Ans. B. A disc and the vertebrae above and below, including their interlocking facet joints.A spinal motion segment is made up of a disc with its adjacent vertebrae and their interlocking facet joints devoid of musculature