question: Q:A 70-year-old woman is evaluated for muscle pain and neck stiffness that has been progressing for the past 3 weeks. She reports that the neck stiffness is worse in the morning and gradually improves throughout the day. She feels fatigued, although there have not been any changes in her daily routine. Her past medical history includes coronary artery disease for which she takes a daily aspirin. Both of her parents died in their 80s from cardiovascular disease. Her blood pressure is 140/90 mm Hg, heart rate is 88/min, respiratory rate is 15/min, and temperature is 37.9°C (100.2°F). On further examination, the patient has difficulty standing up from a seated position, although muscle strength is intact. What is the best next step in management?? 
  {'A': 'Lumbar puncture', 'B': 'Erythrocyte sedimentation rate', 'C': 'Electromyography', 'D': 'Muscle biopsy', 'E': 'Antinuclear antibody'},