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: Medicine
A 25 year old patient underwent normal vaginal delivery. Postpartum she complains of severe headache and visual changes. What is the the most likely cause 
Select and explain. 
A. Sheehan syndrome, B. Postpartum depression, C. TIA, D. Amniotic fluid embolism
A: Sheehan syndrome
Answer: A: Sheehan syndrome 
Explanation: Sheehan syndrome is pituitary hemorrhage or or in fraction during delivery.