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 of the following neuron inhibits deep cerebellar nuclei of cerebellum? 
Select and explain. 
A. Golgi cells, B. Purkinje cells, C. Stellate cells, D. Basket cells
B: Purkinje cells
Answer: B: Purkinje cells 
Explanation: Purkinje cells inhibits deep cerebellar nuclei.
Deep cerecellar nuclei output is always excitatory.