I want to know the answer to the following question:
Which of two neurotransmitters is usually inhibitory?
All the background I'm provided with is that "The two neurotransmitters that are used most widely in the vertebrate brain are glutamate, which almost always exerts excitatory effects on target neurons, and gamma-aminobutyric acid (GABA), which is almost always inhibitory.". Is that enough to answer the question?
Answer: yes