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
The risk factors for placenta pre include all except? 
Select and explain. 
A. Young maternal age, B. Multifetal gestation, C. Cigarette smoking, D. Multiparity
A: Young maternal age
Answer: A: Young maternal age 
Explanation: Young maternal age is not risk factor for placenta pre , whereas advanced maternal age is a risk factor. Risk factor for placenta Pre: Prior history of placenta pre Multifetal gestation: Due to larger placental area Maternal age: Increasing frequency with increasing maternal age Multiparity: Increasing frequency with increasing parity Cigarette smoking: Increased frequency in women who smoke (2X) Elevated prenatal screening MSAFP levels: Unexplained abnormally elevated prenatal screening levels of maternal serum alpha-fetoprotein (MSAFP) are at increased risk of pre. Ref: Williams Obstetrics 25th edition PGno: 775