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
[{'content': 'Gamma motor neurons are mainly influenced by - \nSelect and explain. \nA. Tectospinal tract, B. Vestibulo spinal tract, C. Reticulo spinal tract, D. Corticospinal tract', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]