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Deficiency of which hormone causes diabetes insipidus?
- Insulin
- ADH
- Thyroxine
- Cortisol
Answer: ADH
ADH (Antidiuretic Hormone/Vasopressin) from posterior pituitary promotes water reabsorption in kidneys. Deficiency causes excessive dilute urine (diabetes insipidus), distinct from diabetes mellitus. [[NCERT Biology Class 11]]