You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is In Huntington's chorea all of the following can be found except and explain in detail?
(C) Dysmetria # Huntington's Disease is a fatal autosomal dominant disorder characterized by progressive motor, emotional and cognitive dysfunction.> Onset is typically between the ages of 35 and 45 years.> It is caused by mutations in the Huntington's gene on the short arm of chromosome.> Pathophysiology of Huntington's disease> Loss of the intrastriatal GABA-ergic and cholinergic neurons, ii. The loss of the GABA-ergic pathway to the external--> Pallidum releases inhibition, permitting the hyperkinetic features of the disease to develop, iii. Degeneration of the nigrostriatal dopaminergic system causes Parkinson's disease (see below).> Clinical features of Huntington's disease:> Hyperkinetic choreiform movement, ii. Speech is slurred, iii. Progressive dementia.> Neurotransmitter involved in nigrostriatal pathway is Dopamine.> Dysmetria is a condition in which disturbance of the power to control the range of movement in muscular action.