This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
A 50-year-old man came with the complaint of a headache and raised intracranial tension. Radiological examination revealed a brain tumor compressing Supraoptic nucleus in the hypothalamus. Which of the following hormone is decreased? 
Select and explain. 
A. Adrenocoicotropic hormone (ACTH), B. Follicle-stimulating hormone (FSH), C. Growth hormone, D. Antidiuretic Hormone
D: Antidiuretic Hormone
Answer: D: Antidiuretic Hormone 
Explanation: ADH is formed primarily in the supraoptic nuclei, whereas oxytocin is formed primarily in the paraventricular nuclei whereas other hormones are from the anterior pituitary.