The correct option is A Excess of STH
Acromegaly is caused by excess of STH (somatotrophic hormone), released by anterior lobe of pituitary after adolescence. Elevated GH (growth hormone) causes an excess of bone and soft tissue growth. In adults, this can cause acromegaly. Growth hormone (GH), also known as somatotropin or somatropin, is a peptide hormone that stimulates growth and cell reproduction.