This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2017, Subject name: Medicine
Which of the following leads to development of SIADH? 
Select and explain. 
A. Head trauma, B. Pituitary adenoma, C. Lithium, D. All of the above
A: Head trauma
Answer: A: Head trauma 
Explanation: Causes of SIADH = 1. CNS infection 2. Trauma 3. Meningitis 4. Encephalitis 5. Ectopic Ca tumor Option B: Pit Adenoma = Prolactinoma (increase prolactin), | GH Option C: Lithium = Causes Nephrogenic diabetic insipidus -Manifestation of SIADH- Dilutional Hypernatremia Treatment of SIADH = Vaptan tolvaptan