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: Radiology
Pathognomic feature of hyperparathyroidism: 
Select and explain. 
A. Pathognomic feature of hyperparathyroidism:, B. Loss of Lamina dura, C. Brown's tumor, D. Sub periosteal resoption of phalynges
D: Sub periosteal resoption of phalynges
Answer: D: Sub periosteal resoption of phalynges 
Explanation: D i.e. Subperiosteal resorption of bone (phalynges) Very interestingQ friends as all the options are the features of hyperparathyroidism but they are asking about the hallmark or characteristic feature which is ? Subperiosteal Erosion of bone, paicularly radial aspect of middle phalynx of middle & index finger.Q