The correct option is B Parathyroid
The parathyroid hormone, secreated by the parathyroid gland, maintains proper levels of calcium and phosphorus in blood, by regulating renal action. Thus, controls calcium and phosphorus levels in the bone.
Parathyroid disorders can cause the lowering of blood calcium level. This increases the excitability of nerves and muscles causing cramps and convulsions.
Hormones of the thyroid gland regulate the body's temperature, metabolism, and heart rate, where as hormones of pancreas help maintain blood sugar levels.