Which two hormones are involved in maintaining the homeostasis of blood calcium levels?

Question

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Parathyroid hormone (PTH) and calcitonin are the two hormones involved in maintaining the homeostasis of blood calcium levels. PTH is released by the parathyroid gland when blood calcium levels are low, which stimulates bone breakdown and the release of calcium into the bloodstream. Calcitonin, which is released by the thyroid gland when blood calcium levels are high, promotes the uptake of calcium into bones and reduces its release into the bloodstream. Choice A, C, and D involve hormones that are not directly involved in regulating blood calcium levels.

Which Two Hormones Are Involved in Maintaining the Homeostasis of Blood