Are neurons and neurotransmitters mutually exclusive?

In other words… In one single neuron…say a sensory neuron…can it emit many different types of neurotransmitters or is the type of neuron and its function closely tied to the types of chemical transmitter it can release?

And if they emits different types of transmitters… how do they know which to emit? Will it be related to the action potential that is travelling through the neuron?