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
Anencephaly is associated with the following factor : 
Select and explain. 
A. Hydramnios, B. Postmaturity, C. Prematurity, D. All of these
D: All of these
Answer: D: All of these 
Explanation: All of these