system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 65 year old male was diagnosed with prostate cancer three years back and was treated by surgery and hormone therapy. Presently he has developed urinary symptoms and progressive backache. What is the tumor marker, which can be indicative of disease relapse?
assistant
The correct answer is  Ans. is 'd' i.e. PSA The role of prostate specific antigen as a tumor marker for prostate carcinoma has been discussed in previous year question papers.