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: Pharmacology
Furosemide is useful in: 
Select and explain. 
A. Hypertension., B. Refractory oedema., C. Hypocalcemia., D. Hypokalemia.
B: Refractory oedema.
Answer: B: Refractory oedema. 
Explanation: None