Question

Alfatoxins are produced by
A. Viruses
B. Bacteria
C. Fungi
D. Nematodes

Answer 1

A toxin is a poisonous substance produced within living cells or organisms.
Toxins can be natural or synthetic.
Toxins which are produced naturally are known as natural toxins whereas toxins which we form by using artificial methods are known as artificial toxins.
This term was first used by the organic chemist Ludwig Brieger.

Complete answer:
In order to solve this question we need to know more about the toxin.
A toxin is a poisonous substance produced by various types of living organisms.
Toxins are generally of four types such as physical, chemical, biological and radiation.
Toxin may be a small molecule, peptide, or Protein which is capable of causing disease.
Toxins may vary in their Toxicity which ranges from minor such as a bee sting to almost immediately deadly such as Botulism toxin.
Biotoxins are substances which are toxic in nature and have a biological origin.
Biotoxins can be produced by a variety of living organisms.
There are mycotoxins made by fungi, zootoxins made by animals and phytotoxins made by plants.
Virus produces microbial type of toxin which produces exotoxins by damaging the host cells. Most common virus toxin is Botulinum toxin.
Bacterial toxins are tetanus toxin, exotoxin and diphtheria toxins.
Fungi produce Aflatoxins.
Alfa toxins is a toxin produced by the many fungi which are mainly found on the agriculture crops such as maize, peanut, cotton seeds.
Aspergillus flavus and Aspergillus parasiticus are the most common type of fungi that produce Aflatoxins which are mainly found in warm and humid places.

So, the correct option is option c. Fungi.

Note: Mycotoxins is a toxic secondary metabolite produced by organisms of the fungus kingdom and is capable of causing disease and death in both humans and other animals.
The term 'mycotoxin' is usually reserved for the toxic chemical products produced by fungi that readily colonize crops.
Examples of mycotoxins causing human and animal illness include Alfa toxins, citinin, zearonolone, and ergot alkaloids such as ergotamine.