This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
[{'content': 'All are true regarding Idiopathic edema of woman except- \nSelect and explain. \nA. It is due to estrogen mediated sodium retention, B. It is not related to menstrual cycle, C. There is increased water retention in upright position, D. ACE inhibitors can be useful in some cases', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Idiopathic edema is a common cause of fluid retention and swelling (edema) in women. "Idiopathic" means that the cause of this condition is unknown. Idiopathic edema occurs in the absence of hea, kidney, or liver disease. It is often associated with diabetes, obesity, and emotional problems Ref Davidson 23rd edition pg 369', 'role': 'assistant'}]