Answer:
Acromegaly.
Step-by-step explanation:
Hormones are the chemical substances that regulates the growth and proper functioning of the organisms. The pituitary gland is known as the master gland of the body.
Growth hormones regulate the proper functioning of the body. The deficiency of growth hormone causes dwarfism and its over secretion can cause gigantism. The excess secretion of the growth hormone after puberty is known as acromegaly that causes growth of hands and legs.
Thus, the correct answer is option (a).