Both A and R are correct and R is the correct explanation of A.
Both A and R are correct, but R is not the correct explanation of A.
A is correct but R is incorrect.
A is incorrect but R is correct.
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The Correct Option isA
Solution and Explanation
Viruses are filterable agents, small enough to pass through filters that retain bacteria. These agents cause infectious diseases, confirming both the assertion and reason with correct logical linkage.