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 statements is true for excitatory postsynaptic potentials (EPSP) 
Select and explain. 
A. Are self propagating, B. Show all or none response, C. Are proportional to the amount of transmitter released by the presynaptic neuron, D. Are inhibitory at presynaptic terminal
C: Are proportional to the amount of transmitter released by the presynaptic neuron
Answer: C: Are proportional to the amount of transmitter released by the presynaptic neuron 
Explanation: EPSP is proportional to the amount of neurotransmitter released, so not an ‘all or none’ activity. 
It is not self-propagating, nor does it have any action on presynaptic terminal.