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: Anatomy
[{'content': 'keinbock Osteonecrosis, all true except \nSelect and explain. \nA. Tenderness over base of 3rd metacarpall is present, B. Pain is more on wrist flexion than wrist extension, C. Is the osteochondritis of lunate, D. common age group 20-40', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Kienbock disease: Age: 20-40 yrs osteochondritis of lunate dominant side finesterer&;s sign : tenderness at the base of 3rd metacarpal on making a fist. negative ulnar variance. pain on wrist dorsiflexion REF : MAHESWARI 9TH ED', 'role': 'assistant'}]