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: Physiology
Which of the following acts as a neurotransmitter inhibitor: 
Select and explain. 
A. Glutamate, B. GABA, C. Aspartic acid, D. Lysin
B: GABA
Answer: B: GABA 
Explanation: None