Question

Diseases are broadly grouped into infectious and non-infectious diseases. In the list given below, identify the infectious diseases.
$i$. Cancer
$ii$. Influenza
$iii$. Allergy
$iv$. Small pox

• A. $iii$ and $iv$
• B. $i$ and $ii$
• C. $ii$ and $iii$
• D. $ii$ and $iv$

Answer 1

The correct option is D $ii$ and $iv$

Cancer

Cancer is a disease caused by an uncontrolled division of the cells. It does not spread through contact with an infected person, hence, it is non-infectious.

Influenza

Influenza is caused by a virus that affects the respiratory tract. It is infectious as it can be transmitted through droplets while coughing, sneezing etc.

Allergy

Allergy is a reaction of the immune system to an agent which is recognised as non-self. Allergies depend on the immune system of an individual and cannot be contracted by someone else due to contacts.

Smallpox

Smallpox is a highly infectious disease which is caused by the variola virus.

Final answer

(d) ii and iv