Option 1 states that AIDS is a retroviral disease. This statement is correct because AIDS is caused by the Human Immunodeficiency Virus (HIV), which is a retrovirus belonging to the family of Retroviridae.
Option 2 states that AIDS is transmitted by homo and hetero-sexual contact. This statement is also correct because HIV can be transmitted through sexual activities with an infected person, regardless of their gender or sexual orientation.
Option 3 states that AIDS was first recognized in the USA in 1981. This statement is correct as well because the first cases of AIDS were reported in the United States in 1981, leading to the identification and understanding of the disease.
Option 4 is incorrect because AIDS does not directly cause ano-genital warts. Ano-genital warts are caused by certain types of human papillomavirus (HPV), not by HIV, which is the virus that causes AIDS.
Therefore, the correct answer is option 4.
Alert - correct answer should be: "None of the options are incorrect."