This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Most common hormone deficiency seen after intracranial radiation therapy ? 
Select and explain. 
A. Prolactin, B. Gonadotropins, C. ACTH, D. Growth hormone
D: Growth hormone
Answer: D: Growth hormone 
Explanation: D i.e. Growth hormone Growth hormone deficiency is most common endocrinal complication of intracranial radiotherapyQ. Endocranial dysfunction in intracranial radiotherapy Hypopituitarism frequently occurs after exposure of hyothalmus or pituitary gland to therapeutic radiation; especially in children & adolescent. It develops usually after 5- 15 years and reflects hypothalmic damage rather than absolute destruction of pituitary cells. Irradiation dose & time interval after completion of radiotherapy strongly correlates with the development of hormonal abnormalities.