Assertopm A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.

Reason R: The sand used in slow sand filters is finer than that in rapid sand filters.

Select your answer based on the coding system given below:

- 1
  
  Both A and R are true and R is the correct explanation of A.
- 2
  
  Both A and R are true but R is not the correct explanation of A.
- 3
  
  A is true but R is false
- 4
  
  A is false but R is true

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