<prompt>  A 58 year old woman, who had backache and recurrent chest infections for 6 months, develops sudden. weakness of the legs and urinary retention. Her investigations show a hemoglobin of 7.3 gm dl, serum calcium 12.6 mgdl, phosphate-2.5 mg dl, alkaline phosphatase-100uI, serum albumin-3 gmdl, globulin - 7.1 gindl and urea - 178 mgd.What is the most likely diagnosis -Lung cancerDisseminated tuberculosisMultiple myelomaOsteoporosis 