Which of the following ideal criteria for elimination of a disease is addressed by the following statement: Hepatitis B may establish a chronic infection that can lead to transmission of the disease even in the absence of symptoms?
A. The disease and the vaccine produce long-term immunity.
B. Absence of a long-term carrier state.
C. No animal reservoir.
D. Short persistence in the environment.

Option B

Explanation:

The disease like Hepatitis B may establish a chronic infection in which the disease can get transferred from one person to another even when the symptoms are not visible.

The disease can said to be completely controlled only when there is no carrier state left for the disease in the body of the organism.

The disease is more deadly when it is transferred without showing any symptoms in the body. It can eradicate only when there is no carrier of the disease for a very long period of time.

wegner's theory did not explain how the continents could move

explanation:

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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