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: Surgery
[{'content': 'Chondrocalcinosis is seen in : \nSelect and explain. \nA. Ochronosis, B. Hypoparathyroidism, C. Rickets, D. Hypervitaminosis D', 'role': 'user'}, {'content': "Answer: A \nExplanation: Chondrocalcinosis refers to calcification of aicular cailage. Chondrocalcinosis is seen in: Osteoahritis Gout CPPD Hemochromatosis Wilson's disease HADD Ochronosis Acromegaly Oxalosis Ochronosis refers to the connective tissue manifestation of alkaptonuria and is so named because of the ochre/yellow colour of the deposited pigment seen during microscopic examination. Alkaptonuria is produced by a defect in the metabolism of homogentisic acid that leads to darkening of the urine when exposed to air or reducing agents. Ref: Imaging of Ahritis and Metabolic Bone Disease edited by Barbara N. W. Weissman page 36. Bone and Joint Disorders By Francis A. Burgener page 137.", 'role': 'assistant'}]