This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Which is electrical synapse? 
Select and explain. 
A. Motor end plate, B. Gap junction, C. Tight junctions, D. Pores of kahn
B: Gap junction
Answer: B: Gap junction 
Explanation: In electrical synapses, the membranes of the presynaptic and postsynaptic neurons come close together, and gap junctions form between the cells.(REF: GANONG'S REVIEW OF MEDICAL PHYSIOLOGY 23rd EDITION page no.115)