Answer: Option A.
The hypothalamus is the brain structure responsiblre for regulating thirst, hunger, temperature and sexual behaviour.
Explanation:
Hypothalamus is a part of brain structures located at the floor of the third ventricle below the thalamus and its control the autonomic system.
It controls hunger, thirst, temperature, fatigue, sleep and sexual behaviour . Hypothalamus secretes the anti diuretic hormones which increases the level of water absorbed into the blood by the kidneys and corticotropin releasing hormone which regulate immune system.
I found the attached image on the internet related to this question.
The solid arrows represent neuronal communication. The stimulus, the effects, and the flow of information is all done by receptors and synapses that send a signals across the body in order to have effective feedback responses promoting the homeostasis of the organism.
I think it's the evaporation of water through the stomata :)
I believe the answer is Axis III
In psychiatric problem, the doctor could make diagnosis in 5 different axis to make sure they assess the patient comprehensively. Axis III is dedicated for general medical condition. In this case, serious cystic acne and bad skin would be categorized as general medical condition because it was not psychological or personality disorder.