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: Gynaecology & Obstetrics
[{'content': 'Mrs. X, 25years old with a history of 2 previous pregnancies, and now 28weeks of gestation her gravidity is \nSelect and explain. \nA. Nulligravida, B. G1, C. G2, D. G3', 'role': 'user'}, {'content': "Answer: D \nExplanation: Nulligravida: a woman who currently is not pregnant and has never been pregnant.Gravida: a woman who currently is pregnant or has been in the past, irrespective of the pregnancy outcome. With the establishment of the first pregnancy, she becomes a primigravida, and with successive pregnancies, a multigravida.Reference: William's obstetrics; 25th edition", 'role': 'assistant'}]