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: Gynaecology & Obstetrics
Low maternal serum 25-hydroxyvitamin D is associated with all of the following pregnancy and neonatal outcomes, EXCEPT: 
Select and explain. 
A. Gestational Diabetis, B. Pre-eclampsia, C. Caesarian Section, D. Smal for Gestational Age Neonate
C: Caesarian Section
Answer: C: Caesarian Section 
Explanation: Vitamin D insufficiency is associated with an increased risk of gestational diabetes, pre-eclampsia, and small for gestational age infants. Pregnant women with low 25-OHD levels had an increased risk of bacterial vaginosis and lower bih weight infants, but not delivery by caesarean section. Note: This is an impoant new question. Ref: Association between maternal serum 25-hydroxyvitamin D level and pregnancy and neonatal outcomes: systematic review and meta-analysis of observational studies, BMJ 2013; 346, Published 26 March 2013.