This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
[{'content': 'Trigger finger occurs in -a) Rheumatoid athritisb) Traumac) Osteosarcomad) Osteoarthritis \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc', 'role': 'user'}, {'content': "Answer: B \nExplanation: More common in people with certain medical problems, e.g. Diabetes, Rheumatoid arthritis, Gout, renal disease, Collagen vascular diseases, Dupuytren's disease.\nLocal trauma is a risk factor\nActivities with power grip causes shearing edges of the Al pulley (Pulley of flexor tendon at metacarpophalangeal joint)\nRecent surgery", 'role': 'assistant'}]