An 80-year-old man presented with pain in his lower back and hip. He also complains of waking up in the night to go to the washroom and has urgency as well as dribbling. What is the most likely diagnosis?

The key is D. Prostate carcinoma. [Age, nocturia, urgency and dribbling points towards prostate pathology. Pain of lower back and hip points towards probable bony metastases from prostate cancer. Blood test for PSA; Prostate biopsy; MRI (if initial biopsy is negative, to decide repeat biopsy)].