TB is spread from person to person through the air.
Smallpox The virus can be transmitted through the air by droplets that escape when an infected person coughs, sneezes or talks
Cancer is caused by accumulated damage to genes. Such changes may be due to chance or to exposure to a cancer causing substance.
Two of the viruses that cause hepatitis (hepatitis A and E) can be transmitted through water, food and from person to person.
Answer : (d)