<prompt> Charcot leyden crystal seen in?Allergic rhinitisAcute sinusitisNasal polypAcute tonsillitis  <response>: ANSWER: A Allergic rhinitisREF: Harrisons 18th ed chapter 60Repeat 2012 Session I MicrobiologyCharcot leyden crystals are derived from eosinophils . They are indicative of a disease involving eosinophilic inflammation or proliferation, such as is found in allergic reactions and parasitic infections. Charcot-Leyden crystals are often seen pathologically in patients with bronchial asthma.Charcot Leyden crystal is seen in:Bronchial asthmaAmoebic dysentery in stoolAllergic rhinitiasAllergic fungal sinusitis AFSAllergic bronchopulmonary mycosis ABPM 