The correct answer is [A] RSV Virus (respiratory syncytial virus )

• “Hit & Hide” virus. Each of the viruses you listed are associated with different symptoms and are caused by different types of viruses.
• RSV is a respiratory virus, Dengue is a tropical disease caused by a mosquito-borne virus, Influenza is a common respiratory illness caused by the flu virus, and HIV is a virus that attacks the immune system.

Additional Information

1.  RSV Virus (respiratory syncytial virus) is a common respiratory virus that primarily affects infants and young children. It is responsible for causing respiratory illness, including bronchiolitis and pneumonia.
2.  Dengue virus is a tropical disease caused by a mosquito-borne virus. It is common in Southeast Asia, Africa, and South America, and can cause fever, headache, and muscle and joint pain. In some cases, it can lead to severe dengue, also known as dengue hemorrhagic fever, which can be fatal.
3.  Influenza virus (the flu) is a common respiratory illness caused by the flu virus. It can cause symptoms such as fever, cough, sore throat, and body aches.
4.  HIV virus (human immunodeficiency virus) is a virus that attacks the immune system. It is the virus that causes AIDS (Acquired Immunodeficiency Syndrome). If left untreated, HIV can lead to the development of AIDS, which can be fatal.

So, the correct answer is [A] RSV Virus (respiratory syncytial virus )