A disease caused by one of the smallest known virus is
A
Mumps
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B
Measles
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C
Poliomyelitis
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D
Trachoma
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Solution
The correct option is B Poliomyelitis Poliomyelitis, often known as polio or infantile paralysis, is an infectious disease caused by the poliovirus. In about 0.5 per cent of cases, there is muscle weakness resulting in an inability to move. The viral particle is about 30 nm in diameter with icosahedral symmetry. Because of its short genome and its simple composition (only RNA and a nonenveloped icosahedral protein coat), poliovirus is widely regarded as the simplest significant virus.