This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'An 18 year old male presented with acute onset descending paralysis of 3 days duration. There is also a 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 probable diagnosis is: \nSelect and explain. \nA. Poliomyelitis, B. Botulism, C. Diphtheria, D. Porphyria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diagnosis of botulism should be considered in patient with symmetric descending paralysis with bilateral cranial neuropathies in addition of following features:\n\nAbsent fever\nPatient remains responsive\nHeart rate normal or slow\nSensory deficit doesn’t occur except for blurred vision.\n\nRemember: Neurologic signs and symptom of botulism:\n\nDysphagia\nDry mouth\nDiplopia\nDysarthria\nUpper limb weakness\nLower limb weakness\nBlurred vision\nDyspnea', 'role': 'assistant'}]