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
Increase in threshold level on applying subthreshold, slowly rising stimulus is known as 
Select and explain. 
A. Adaptation, B. Accomodation, C. Refractoriness, D. Electrotonus
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.
Refractoriness- A stimulus to the nerve does not elicit a response.
Electrotonus- When a current is passed through electrodes kept on the surface of a nerve, current passes through it resulting in a change in membrane potential and development of electrotonic potential.