Which of these is most likely the primary cancer in this patient?

A 65-year- old man presents with gradual low back pain increasing in intensity for the last six months. X-
ray shows several osteoblastic lesions on lower vertebra and pelvic bones. Additional investigations
reveal that those lesions are metastases.
Which of these is most likely the primary cancer in this patient?
A-Chronic lymphocytic leukemia
B-Hodgkin’s lymphoma
C-Prostatic cancer
D-Renal cell carcinoma
E-Thyroid follicular carcinoma
Answer: https://goo.gl/2kvHr4

Ans C