Q. Consider the following statements:
1. Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes.
2. Common cold is sometime caused by an adenovirus whereas AIDS is caused by a retrovirus.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: B
Notes:

Why this Question) Viruses and health issues in news in last one year. 

Ans) b 

Exp) Option b is correct.  

Adenoviruses are a group of common viruses that infect the lining of your eyes, airways and lungs, intestines, urinary tract, and nervous system. They’re common causes of fever, coughs, sore throats, diarrhoea, and pink eye. Infections happen in children more often than in adults, but anyone can get them. 

Statement 1 is incorrect. The adenovirus genome is a single linear molecule of double-stranded DNA while retroviruses are single-stranded DNA. 

Statement 2 is correct. Common cold is caused by adenoviruses. HIV is caused by retrovirus. HIV is classified as a retrovirus because it contains reverse transcriptase. It is a D-type virus in the Lentivirus family.   

Source:  https://www.sciencedirect.com/topics/neuroscience/adenovirus-genome  

https://www.healthline.com/health/what-is-a-retrovirus#virus-vs-retrovirus 

Subject) Science