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: Gynaecology & Obstetrics
[{'content': 'Blood will interfere with the nitrazine test for de tecting ruptured membranes because: \nSelect and explain. \nA. It is acid, B. It is alkaline, C. It contains increased amounts of sodium chloride, D. It contains decreased amounts of sodium chloride', 'role': 'user'}, {'content': 'Answer: B \nExplanation: It is alkaline', 'role': 'assistant'}]