| Consider the following statements. |
| 1. All parasites are pathogens. |
| 2. Pathogens have to adapt to life within the environment of the host. |
| 3. Rhinoviruses, a pathogen causes the common cold in humans. |
| 4. All cancers are non-pathogenic diseases i.e. they are genetic in origin. |
| Which of the statements given above are correct? |
A) 1, 2 and 3
B) 1, 3 and 4
C) 2 and 4
D) All of these
Correct Answer: A
Solution :
[a] All cancers are not non-pathogenie. An oncovirus is a virus that can cause cancer. This term originated from studies of acutely transforming retroviruses in the 1950-60s, often called oncornaviruses to denote their RNA virus origin. It now refers to any virus with a DNA or RNA genome causing cancer and is synonymous with 'tumor virus' or 'cancer virus'. The vast majority of human and animal viruses do not cause cancer, probably because of long-standing coevolution between the virus and its host.
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