<prompt> Anosmia is early clinical feature ofAlzheimerParkinsons diseaseHuntingtons choreaAll of the above  <response>: Ans. is d i.e., All of the above Main causes of anosmia Main causes of anosmia Nasal. Smoking. Chronic rhinitis allergic, atrophic, cocaine, infectious-Herpes, influenza. Overuse of nasal vasoconstrictors. Olfactory epithelium. Head injury with tearing of olfactory, filaments Cranial surgery. Subarachnoid hemorrhage, meningitis. Toxic organic solvents, ceain antibiotics-am inoglycosides, tetracyclines, coicosteroids, methotrexate, opiates, 1-dopa. Metabolic thiamine deficiency, adrenal and thyroid deficiency, cirrhosis, renal failure, menses. Wegener granulomatosis. Compressive and infiltrative lesions craniopharyngioma, meningioma, aneurysm, meningoencephalocele. Degenerative disease Parkinson, Alzheimer, Huntington Temporal lobe epilepsy. Malingering and hysteria 