Which of the following symptoms can result from a large exposure to cyanide?

Cyanide is a highly toxic compound that acts as an inhibitor of cellular respiration. When exposed in large amounts, it interferes with the body's ability to utilize oxygen, leading to a variety of severe symptoms, one of which is convulsions. This occurs because cyanide disrupts the metabolic functions of neurons, resulting in hyperexcitation of the nervous system. The inability of cells, particularly in the brain, to produce energy can trigger these involuntary muscle contractions.

In contrast, fatigue is a non-specific symptom that can arise from various conditions and typically does not indicate cyanide poisoning specifically. Allergic reactions involve the immune system’s response to substances, which is not directly related to cyanide exposure. Fever is not a common symptom associated with cyanide toxicity, as the body does not typically mount an inflammatory response in this scenario. Therefore, convulsions stand out as a direct and alarming result of significant cyanide exposure, showcasing the critical biochemical consequences of this poison on the nervous system.