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
Mrs. Y, 25years with the previous history of twin pregnancy delivered at 36weeks, now at 10weeks of gestation, her obstetric score is 
Select and explain. 
A. G1P1L2, B. G1P2L2, C. G2P1L2, D. G2P2L2
C: G2P1L2
Answer: C: G2P1L2 
Explanation: 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.Nullipara: a woman who has never completed a pregnancy beyond 20 weeks' gestation. She may not have been pregnant or may have had a spontaneous or elective aboion(s) or an ectopic pregnancy.Primipara: a woman who has been delivered only once of a fetus or fetuses born alive or dead with an estimated length of gestation of 20 or more weeks.Multipara: a woman who has completed two or more pregnancies to 20 weeks' gestation or more. Parity is determined by the number of pregnancies delivered reaching 20 weeks. It is not increased to a higher number if multiples are delivered in a given pregnancy. Moreover, stillbih does not lower this number.Reference: William's obstetrics; 25th edition