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': 'Which one of the following test detects Fetal skin cells? \nSelect and explain. \nA. Shake test, B. Nile blue sulphate test, C. Litmus test, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nile blue sulphate test', 'role': 'assistant'}]