This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Motor System, Subject name: Physiology
[{'content': 'Upper motor neuron lesion will not cause: \nSelect and explain. \nA. Hypeonia, B. Fasciculations, C. Positive Babinski, D. Hyper-reflexia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Upper motor neurons lesions initially causes muscles to become weak and flaccid but eventually leads to spasticity, hypeonia, hyperactive stretch reflexes. Upper motor neurons include: Coicospinal tract or pyramidal tract Extrapyramidal tract: rubrospinal, tectospinal, vestibulospinal, reticulospinal Upper motor neuron paralysis lower motor neuron paralysis Affects whole groups of muscles - like hemiplegia, paraplegia, or monoplegia Single muscles affected No atrophy Severe atrophy No fasciculations Fasciculations present Rigidity Flaccid paralysis Increased tendon reflexes (Hyper-reflexia) Absent tendon reflexes Extensor plantar reflex (Babinski sign) Normal, if present Hypeonia Hypotonia', 'role': 'assistant'}]