Concept:The hypothalamus is the brain centre responsible for maintaining homeostasis, including body temperature, thirst, and hunger.
Explanation:The hypothalamus detects changes in body conditions and triggers appropriate responses.
It regulates body temperature by causing sweating or shivering when necessary.
It controls thirst by monitoring water balance in the body.
It regulates hunger by responding to nutrient levels and appetite signals.
The thalamus mainly relays sensory and motor information, so it is not correct.
The medulla oblongata controls breathing, heart rate, and blood pressure, not hunger or thirst.
The spinal cord transmits signals and controls reflexes, not these regulatory functions.
Thus, the hypothalamus is the correct answer.
Answer:B. hypothalamus