This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
The function of the preoptic nucleus of the hypothalamus 
Select and explain. 
A. Temperature regulation, B. Thirst, C. GI stimulation, D. Satiety centre
A: Temperature regulation
Answer: A: Temperature regulation 
Explanation: Functions of Hypothalamus
-        Thermoregulation- Preoptic region

Anterior hypothalamus- Heat response​
Posterior hypothalamus- Cold response

-        Satiety centre- ventromedial nucleus
-        Feeding centre- Lateral nucleus
-        Circadian rhythm- Suprachiasmatic nucleus
-        Sleep
-        Sex drive-  Anterior hypothalamus, Posterior hypothalamus.
-        Hypophysis regulation