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: Physiology
[{'content': 'In contraction stress test, positive interpretation is: \nSelect and explain. \nA. Early deceleration, B. Early acceleration, C. Persistent late deceleration, D. Variable deceleration', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Persistent late decelerationIt is an invasive method to assess fetal well being during pregnancy, when there is alteration in FHR in response to uterine contraction. It suggests fetal hypoxia.', 'role': 'assistant'}]