Answer: Option (A)
Explanation:
Avian influenza is referred to as or known as the disease which is often caused or spread by the infection related with avian influenza Type A viruses also known as bird flu. These viruses often tend to occur naturally mostly among the wild aquatic birds available worldwide and thus can infect the domestic poultry and several other animal and bird species. These viruses do not tend to normally infect any human.
