This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis in obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following explanations is not an explanation for decreased variability of the fetal hea tracing? \nSelect and explain. \nA. Fetal"sleep state", B. Prematurity, C. Barbiturate ingestion, D. Fetal stimulation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The external sound stimulates the fetus provoking fetal hea rate acceleration in cases thought be nonreactive.This is termed stale response refer pgno:510 sheila textbook of obstetrics', 'role': 'assistant'}]