Which of the following is the most probable diagnosis of the patient with the following x-ray?

Ans. is 'b' i.e., Pott's spine * Characteristic radiological feature of pott's spine is obliteration of disc space with destruction (wedge compression) of one or two adjacent vertebrae.* This feature differentiates Koch's spine from other diseases causing vertebral destruction (like metastasis, multiple myeloma), in which disc space is preserved.