This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
[{'content': 'Blood will interfere with the nitrazine test for detecting ruptured membranes because: \nSelect and explain. \nA. It is acid, B. It is alkaline, C. It contains increased amounts us sodium chloride, D. It contains decreased amounts of sodium chloride', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Blood mixes with nitrazine to produce false positive results, as there is increase in ph. It turns the litmus paper to blue suggestive of PROM. TEXTBOOK OF OBSTETRICS, SHEILA BALAKRISHNAN, 2nd EDITION,pg:197', 'role': 'assistant'}]