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
Twitch of a single motor unit is called 
Select and explain. 
A. Myoclonic jerk, B. Fasciculation, C. Tremor, D. Fibrillation
B: Fasciculation
Answer: B: Fasciculation 
Explanation: Contraction of a single muscle fiber is called fibrillation.Involuntary contractions of individual motor units are termed as fasciculations.Ref: Robbin&;s&; 9th edition; Chapter 28 The Central Nervous System