The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following Slatements is not true?   (A) Parathyroid hormone-related protein is responsible for causing hypercalcemia in cancer patients   (B) The unionized fraction of calcium in the plasma is an impoant determinant of PTH secretion   (C) Mg2+ influences PTH secretion in the same direction as Ca2+ but is a less potent secretagogue   (D) Ca2+influences PTH secretion by acting on a calcium sensor G-protein coupled receptor located in the parathyroid gland
['(B) The unionized fraction of calcium in the plasma is an impoant determinant of PTH secretion <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Parathyroid hormone-related protein is responsible for causing hypercalcemia in cancer patients \n (B) The unionized fraction of calcium in the plasma is an impoant determinant of PTH secretion \n (C) Mg2+ influences PTH secretion in the same direction as Ca2+ but is a less potent secretagogue \n (D) Ca2+influences PTH secretion by acting on a calcium sensor G-protein coupled receptor located in the parathyroid gland <> possible answers', '  Which of the following Slatements is not true? <> context@']