<prompt> Which of the following is true about calcification?It is most commonly seen in the kidneysSerum calcium is normal in metastatic calcificationPsammoma body is formed with dystrophic calcificationMitochondria is the rarest organelle affected in calcification  <response>: Types of Calcification Feature DYSTROPHIC CALCIFICATION METASTATIC CALCIFICATION Definition Deposits of calcium salts in dead and degenerated tissues Deposits of calcium salts in normal tissues Cause Necrosis Infarcts Thrombi Haematomas Dead parasites Atheromas Ceain tumours Cysts Calcinosis cutis Old scars,etc Hyperparathyroidism Hyperplasia Bony destructive lesions Hypercalcaemia of infancy Prolonged immobilisation Hypervitaminosis D Milk-alkali syndrome Calcium metabolism Normal Deranged Serum Calcium Level Normal Hypercalcaemia 