You are answering a USMLE-style medical question. Question: A 42-year-old man presents to establish care with a family physician after having progressively worsening back pain. He has recently migrated from Sweden and has not had any checkups in the last 3 years. He first started having back pain 3 years ago, but his pain has begun to be excruciating in the mornings. He is no longer able to get relief with over the counter medications. He also feels stiff every morning and this usually lasts between 30 minutes and an hour. Both of his knees are also very painful, particularly upon standing up from a seated position. His pain improves when he moves around, so he tries to be somewhat physically active. He also reports that he cannot use his hands for long periods of time due to joint pain and stiffness. His father and sister also have joint issues, and his mother was recently diagnosed with osteoporosis. He has been a smoker for 13 years. Upon physical examination, his wrist and proximal interphalangeal (PIP) joints are warm and swollen. Which of the following is the next best step in management? Options: A) Testing for serum Ca and PTH B) Calcium and Vitamin D prescription C) Testing for serum ESR and autoantibodies D) Testing for serum ferritin Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.