This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
Which of the following hormonal concentration decreases with age? 
Select and explain. 
A. Parathormone, B. FSH, C. Growth hormone, D. Norepinephrine
C: Growth hormone
Answer: C: Growth hormone 
Explanation: Secretion of growth hormone (GH) and IGF-1 levels decline during advancing years-of-life. These changes (somatopause) are associated with loss of vitality, muscle mass, physical function, together with the occurrence of frailty, central adiposity, cardiovascular complications, and deterioration of mental function.Ref: Ganong&;s review of medical physiology; 24th edition; page no: 327