The diameter of micro pore filter used in bacteria filtration is:

<p style="text-align:left;"><strong><span>            A  0.22 microns</span></strong></p> <p style="text-align:left;"><strong><span> B    0.033 microns</span></strong></p> <p style="text-align:left;"><strong><span>  C    2.2 microns</span></strong></p> <p style="text-align:left;"> </p> <p style="text-align:left;"><span><strong>  D    0.45 microns</strong></span></p>