<prompt> Most common cause of primary hyperparathyroidism -HyperplasiaSolitary- AdenomaCarcinomaMultiple adenomas  <response>: Ans. is b i.e., Adenoma Hyperparathyroidismo Hyperparathyroidism is caused by elevated parathyroid hormone.o Primary hyperparathyroidism : an autonomous overproduction of parathyroid hormone PTH, usually resulting from an adenoma or hyperplasia of parathyroid tissue.HyperparathyroidismParathyroidadenoma85-95Primaryhypoplasia5-10ParathyroidcarcinomaNote: The most common cause of primary hyperparathyroidism is a solitary parathyroid adenoma arising sporadically. 