Final answer:
Pituitary dwarfism is caused by a deficiency of growth hormone (GH) in children, while giantism is caused by excessive GH secretion. Acromegaly is a disorder in adults characterized by excessive bone growth due to high GH levels. Hence the correct answer is option A
Step-by-step explanation:
Pituitary dwarfism is a condition caused by a deficiency of growth hormone (GH) in children. It is characterized by reduced growth and individuals may be under 30 inches in height. Giantism, on the other hand, is a condition caused by excessive secretion of GH in children, resulting in excessive growth. Acromegaly is a disorder in adults where there is excessive growth of bones in the face, hands, and feet in response to high GH levels.
Hence the correct answer is option A