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: Radiology
Radiation therapy to hypoxic tissues may be potentiated by the treatment with – 
Select and explain. 
A. Mycostatin, B. Metronidazole, C. Methotrexate, D. Melphalan
B: Metronidazole
Answer: B: Metronidazole 
Explanation: None