<prompt> An 18 year old male presented with acute onset descending paralysis of 3 days duration. There is also history of blurring of vision for the same duration. On examination, the patient has quadriparesis with areflexia. Both the pupils are non-reactive. The most probably diagnosis is -PoliomyelitisBotulismDiphtheriaPorphyria  <response>: Descending paralysis, blurring of vision, quadriparesis flaccid paralysis, areflexia and nonreactive pupilsRef:Apurba Sastrys Essentials of Medical Microbiology 1e p264, Harrison 19e p987, 18e p1201 