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 one of the following clearly states the role of cerebellum in motor performance 
Select and explain. 
A. Planning and programming of movement, B. Convert abstract thought into voluntary action, C. Initiation of skilled voluntary action, D. Smoothens and coordinates ongoing movements
D: Smoothens and coordinates ongoing movements
Answer: D: Smoothens and coordinates ongoing movements 
Explanation: Initiation of skilled voluntary action is from motor cortex.
Convert abstract thought into voluntary action is same as planning and programming. Planning and programming, though a function of cerebellum, requires basal ganglia to be involved.
The clear and best known function of cerebellum is smoothening and co-ordination of ongoing movements.