This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
[{'content': 'Which is the most significant finding in cardiotocography for detection of fetal hypoxia? \nSelect and explain. \nA. Late deceleration, B. Variable deceleration, C. Sinusoidal deceleration, D. Early deceleration', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Late decelerations are smooth falls in the FHR beginning after the contractions has staed and ending after the contractions has ended. They are associated with fetal hypoxemia and potential for perinatal morbidity and moality. Ref:Williams Obs 23e pg 420.', 'role': 'assistant'}]