<prompt> Decreased ability to smell isAnosmiaHyposmiaPhantosmiaHyperosmia  <response>: B Hyposmia Hyposmia: Hyposmia is a state of decreased sensation of smell Disorders of the Sense of Smell: Transport losses - Rhinitis, polypsneoplasms of nasal cavity Sensory losses - Drugs, radiation therapy, toxin exposure Neural losses - Alps, alcoholism, Alzheimers, Kallman syndrome, hypothyroidism etc., Treatment: There is no proven treatment for sensorineural olfactory losses. Fortunately, spontaneous recovery often occurs. Zinc and vitamin therapy especially with vitamin A are advocated by some. Profound zinc deficiency can produce loss and distortion of the sense of smell but is not a clinically important problem except in very limited geographic areas 