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: Psychiatry
All of the following neurotransmitters are suspected of being involved in the pathophysiology of schizophrenia except -a) Prostaglandins E b) Norepinephrinec) Ascorbic acidd) 5-HT 
Select and explain. 
A. a, B. ac, C. ad, D. b
B: ac
Answer: B: ac 
Explanation: None