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': 'The pulse oximetry reading is affected in \nSelect and explain. \nA. Anemia, B. Jaundice, C. Red nail polish, D. Dark skin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pulse oximetry values can be erroneous in dark skin. But in all other cases it is normal.', 'role': 'assistant'}]