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': "Sudeck's atrophy is associated with -a) Osteoporosisb) Osteophyte formationc) Osteopeniad) Osteochondritis \nSelect and explain. \nA. a, B. ac, C. ad, D. b", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Initial stages of RSD shows spotty osteoporosis (osteopenia).\nWhile in later stages there is characteristic diffuse homogenous osteoporosis (osteopenia).', 'role': 'assistant'}]