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 of the following explanations is not an explanation for decreased variability of the fetal heart tracing: \nSelect and explain. \nA. Fetal "sleep state", B. Prematurity, C. Barbiturate ingestion, D. Fetal stimulation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Baseline varibility on CTG is the oscillation of baseline FHR excluding acceleration and deceleration.\nA varibility of 5-25 BPM is a sign of fetal well-being.\nDecreased varibility is seen in:\n\nFetal hypoxia\nSleep apnoea\nCongenital malformation\nMaternal academia\nInfection\nDrugs given to mother such as sedatives, magnesim sulfphate, antihypertensives\n\nWilliams 22/e, p 499: Drugs given to moter which decrease the baseline varibility are:\n\nNarcotics\nBarbiturates\nPhenothiazines\nTranquilizers\nGeneral anaesthetics\nMeperidine\nButorphanol\nMgSO4\n\nAccording to Wiliams Increasing gestational age leads to increased baseline varibility, so it can be taken prematurity will have decreased varibility (i.e. option ‘b’ can be considered correct).', 'role': 'assistant'}]