An otherwise healthy 37 y/o man comes to the physician because of a 3-month history of low back pain. Use of NSAID has provided moderate relief. Forward flexion of the spine is normal and does not produce pain, hyperextension of the spine increase the pain. Muscle strength in the lower extremities is 5/5; sensation and reflexes are normal. A lateral X-ray of the lumbar spine is hsown. Which of the following is most likely diagnosis?

A. Compression fracture
B. intervertebral disc space infection
C osteitis deformans (Paget disease)
D. Osteoporosis
E. spondylolisthesis