Final answer:
The gland influencing all other endocrine glands is the pituitary gland, often referred to as the "master gland."
Step-by-step explanation:
The gland known to influence all the other glands within the endocrine system is the pituitary gland. Often referred to as the "master gland," the pituitary gland produces hormones that regulate the activity of most other hormone-secreting glands, including the thyroid gland, parathyroid glands, adrenal glands, gonads (testes and ovaries), and the thymus gland.
Thus, the correct answer is not listed among the options a) Adrenal gland, b) Pineal gland, c) Hypothalamus, or d) Pancreas in the given question, it should be the pituitary gland.
It produces hormones that control other endocrine glands, such as the thyroid gland, parathyroid glands, pineal gland, pancreas, adrenal glands, gonads (testes and ovaries), and thymus gland.