Lifesaving hormones crucial for regulating various bodily functions are secreted from multiple glands, including the adrenal, pituitary, and thyroid glands. The adrenal gland produces hormones like adrenaline and cortisol, vital for managing stress and metabolism. The pituitary gland releases hormones such as growth hormone and oxytocin, essential for growth and childbirth. The thyroid gland secretes hormones like thyroxine, crucial for metabolism and energy regulation. Collectively, these glands play pivotal roles in maintaining homeostasis and responding to internal and external stimuli, making all options (a) Adrenal, (b) Pituitary, and (c) Thyroid valid for the secretion of lifesaving hormones, rendering the correct choice (d) All of the above.