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
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 - 
Select and explain. 
A. Poliomyelitis, B. Botulism, C. Diphtheria, D. Porphyria
B: Botulism
Answer: B: Botulism 
Explanation: Descending paralysis, blurring of vision, quadriparesis (flaccid paralysis), areflexia and nonreactive pupils
Ref:Apurba Sastry’s Essentials of Medical Microbiology 1/e p264, Harrison 19/e p987, 18/e p1201