This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intra Uterine Growth Restriction, Intrapaum and Antepaum Fetal Surviellance, Subject name: Gynaecology & Obstetrics
[{'content': 'Normal Beat to beat variability in an NST on a term fetus is ? \nSelect and explain. \nA. 25-Jun, B. 5-Jan, C. >25, D. any variability which is above 110 baseline is normal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Beat-to-Beat Variability - - Fetal hea variability is divided into four types: 1. Absent : Undetectable change in amplitude 2. Minimal: <= 5 bpm in range 3. Moderate : 6-25 bpm 4. High: > 25 bpm', 'role': 'assistant'}]