Question

primary hyperparathyroidism results when there is abnormal secretion of parathyroid hormone from what?
parafollicular cells
parathyroid gland
kidney failure
thyroid gland

Explanation:

Primary hyperparathyroidism is caused by abnormal secretion of parathyroid hormone from the parathyroid gland. Parafollicular cells secrete calcitonin, kidney failure can affect calcium - related processes but is not the source of parathyroid hormone secretion, and the thyroid gland mainly secretes thyroid hormones.

Answer:

B. Parathyroid gland