This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
A patient developed paraplegia. On routine examination and X-ray it was found that there are osteoblastic lesion in his spine. What is the MOST probable diagnosis? 
Select and explain. 
A. Carcinoma thyroid, B. Ca. Prostate, C. Breast Ca., D. Pancreatic Ca.
B: Ca. Prostate
Answer: B: Ca. Prostate 
Explanation: Patients with prostate cancer develop osteoblastic metastasis to the bones. 80% of patients who die from prostate cancer have bone metastases at autopsy. The most common sites of metastasis are veebral column, pelvis, ribs and proximal long bones. These sites corresponds to the most abundant regions of bone marrow in the skeleton. Osteolytic metastases: It commonly originates from cancers of thyroid, kidney, adrenal, GIT and uterus. Mixed form metastases occur in: Cancers originating in bronchi, breast, cervix and ovary. Ref: Comprehensive Textbook of Genitourinary Oncology edited by Nicholas Vogelzang page 39.