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
Initiation of lactation is affected by:a) Oxytocinb) Prolactinc) HPLd) Thyroid hormonee) Progesterone 
Select and explain. 
A. abce, B. abcd, C. acde, D. abde
A: abce
Answer: A: abce 
Explanation: None