Acromegaly is a disorder of:
**Core Concept**
Acromegaly is a rare hormonal disorder resulting from the excessive production of growth hormone (GH) after normal growth has stopped, leading to abnormal growth and development of body tissues.
**Why the Correct Answer is Right**
Acromegaly is caused by a benign tumor on the pituitary gland, which produces excess GH. This excess GH stimulates the production of insulin-like growth factor 1 (IGF-1), which in turn causes the growth and development of body tissues, leading to the characteristic features of acromegaly, such as enlarged hands and feet, facial changes, and joint problems. The pituitary gland, located at the base of the brain, regulates the production of various hormones, including GH.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the question as it does not relate to the cause of acromegaly.
**Option B:** While insulin resistance can be a feature of acromegaly, it is not the disorder itself.
**Option C:** This option is incorrect as it is not a direct cause of acromegaly, although it can be a feature of the disorder.
**Clinical Pearl / High-Yield Fact**
The diagnosis of acromegaly is often delayed due to the gradual onset of symptoms, which can be mistaken for other conditions, such as hypothyroidism or sleep apnea.
**Correct Answer:** C.