Clostridium botulinum is dangerous because it produces a deadly toxin under which conditions?
a.In strongly acidic preparations such as lemon juice and citrus marinades
b.In anaerobic (oxygen-free) environments such as improperly canned or ROP foods
c.In dehydrated pantry commodities such as flour, crackers, and dried beans
d.In aerated (aerobic) preparations such as stock simmering in an open pot
Explanation
Clostridium botulinum grows and forms toxin in anaerobic, low-acid, moist environments such as improperly home-canned foods, ROP (reduced-oxygen packaged) foods, and garlic-in-oil mixtures. Each wrong option names a condition that stops it: the low pH of lemon juice or a citrus marinade inhibits it, the oxygen in a pot simmering uncovered inhibits it, and dehydrated commodities such as flour and crackers are too dry to support it. The toxin attacks the nervous system.
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