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': 'Fetal heart tracing findings in case of maternal carbon monoxide poisoning includes all except \nSelect and explain. \nA. Elevated baseline, B. Absence of accelerations, C. Marked beat-to-beat variability, D. Decreased beat-to-beat variability', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Fetal heart rate pattern in maternal carbon monoxide poisoning shows:\n→ Elevated baseline\n→ Diminished variability\n→ Absent accelerations and decelerations.', 'role': 'assistant'}]