The thyroid stimulating hormone (TSH) is produced by the pituitary gland. TSH plays a key role in regulating the function of the thyroid gland by stimulating it to produce thyroid hormones such as thyroxine.
- Thyroid produces thyroid hormones but does not produce TSH.
- Parathyroid produces parathyroid hormone (PTH), which regulates calcium levels.
- Pituitary produces TSH as part of its endocrine function to control other glands, including the thyroid.
- Pineal produces melatonin, which regulates sleep patterns but not thyroid hormone production.
Thus, the correct answer is (C) Pituitary, which produces TSH.
Final Answer: (C)