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: Anaesthesia
[{'content': 'Pulse oxymetry detects inaccurately in presence of – a) Hyperbilirubinemiab) Nail polishc) Methemoglobinemiad) Skin pigmentation \nSelect and explain. \nA. abc, B. bcd, C. ac, D. bd', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Inaccurate reading in pulse oximeter can be caused by carboxyhaemoglobinemia, methaemoglobinemia, anaemia, poor peripheral pulsation, hypovolemia & vasoconstriction, vasodilatation, nail polish, shivering, skin pigmentation, and SpO2 below 60%.', 'role': 'assistant'}]