Final answer:
The major fungal genus that produces aflatoxin is Aspergillus, which can contaminate food and lead to serious health concerns.
Step-by-step explanation:
The major fungal genus that produces aflatoxin is Aspergillus. Aflatoxins are toxic carcinogens predominantly made by Aspergillus flavus and Aspergillus parasiticus. These compounds can contaminate crops such as nuts and grains, leading to serious human health issues if ingested, including liver cancer. Aflatoxin production is a significant concern for health and agriculture, as it can cause food recalls and have economic impacts, especially in developing countries where food shortages can become exacerbated.