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
The increase in the threshold of a receptor when a series of stimuli of subthreshold intensity are applied in succession is called 
Select and explain. 
A. Adaptation, B. Accomodation, C. Initiation, D. Resistance
B: Accomodation
Answer: B: Accomodation 
Explanation: Accommodation - Slow rising subthreshold stimulus failing to produce action potential even when the normal threshold levels are reached. 
This occurs because of inactivation of voltage-gated Na+ channels. 
Adaptation- Persistent application of suprathreshold stimulus fails to generate repetitive firing.