Which of the following is a pair of viral diseases?

Q. Which of the following are viral diseases?

(a) Syphilis
(b) Cholera
(c) AIDS
(d) Dengue
(e) Leprosy
(f) Influenza

Q. Which of following is a pair of viral diseases?

Q. Which one among the following is correct?

$1$. Common cold - Droplet transmission
$2$. Typhoid - Contaminated food and water
$3$. AIDS - Shaking hands
$4$. Ringworm - Using infected towels

Q. Which of the following statements is correct?
1. Common cold - Droplet infection.
2. Typhoid - Contaminated food and water.
3. AIDS - Shaking hands.
4. Ringworm - Using infected towels.