31. A 40-year-old man is brought to emergency department by his wife with complaints of dizziness...

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31. A 40-year-old man is brought to emergency department by his wife with complaints of dizziness and blurring of vision for several hours. His wife adds that he has slurred speech since this morning and was complaining of difficulty swallowing last night. His wife mentions that her husband was working outdoors and eating stew with roasted beef and potatoes that had been sitting on the stove for past 3 days. The past medical history is unremarkable. The physical examination reveals night eye ptosis and palatal weakness with an impaired gag reflex. The cranial nerve examination reveals findings suggestive of CN V and VII lesions. What is the mechanism of action of the toxin that most likely is causing this patient's symptoms? a. Expression of superantigen b. Ribosylation of eukaryotic elongation factor-2 c. Inhibition of glycine and GABA d. Inhibition of release of acetylcholine 31. A 40-year-old man is brought to emergency department by his wife with complaints of dizziness and blurring of vision for several hours. His wife adds that he has slurred speech since this morning and was complaining of difficulty swallowing last night. His wife mentions that her husband was working outdoors and eating stew with roasted beef and potatoes that had been sitting on the stove for past 3 days. The past medical history is unremarkable. The physical examination reveals night eye ptosis and palatal weakness with an impaired gag reflex. The cranial nerve examination reveals findings suggestive of CN V and VII lesions. What is the mechanism of action of the toxin that most likely is causing this patient's symptoms? a. Expression of superantigen b. Ribosylation of eukaryotic elongation factor-2 c. Inhibition of glycine and GABA d. Inhibition of release of acetylcholine