Which of the following statements about the differential diagnosis of hypercalcemia is/are correct

B. The diagnosis of primary hyperparathyroidism is supported by these serum levels: calcium, 10.8 mg. per dl.; chloride, 104 mmol. per liter; bicarbonate 21 mmol. per liter; phosphorus, 2.4 mg. per dl.; elevated parathyroid hormone.

DISCUSSION: Malignant tumors rarely secrete PTH itself; they can secrete PTHrP or cytokine activators of osteoclast activity. The diagnosis of primary hyperparathyroidism is supported by hypercalcemia with mild hyperchloremic metabolic acidosis and a chloride-phosphate ratio greater than 33 or a modified chloride (mmol. per liter/mg. per dl.) phosphate ratio greater than 500. Familial hypocalciuric hypercalcemia is distinguished from primary hyperparathyroidism by a low urine calcium. Serum calcium changes approximately 0.8 mg. per dl. for every 1 gm. per dl. change in serum albumin. Thiazide diuretics can cause hypercalcemia and should not be given to patients who are hypercalcemic.