You are answering a USMLE-style medical question. Question: A novel type of PET radiotracer is being developed to evaluate patients with Parkinson’s disease. A clinical research study has enrolled 1,200 patients, half of whom have the disease. The scan is found to be positive in 590 of the 600 patients with known PD, and positive in 20 of the 600 patients without PD. What is the test’s overall specificity? Options: A) 580 / (20 + 590) B) 580 / (10 + 580) C) 590 / (590 + 10) D) 580 / (580 + 20) Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.