Match the names of branches of biology listed under column $I$ with the field of study given under column $II$; choose the answer which gives the correct combiantion of the alphabets of the two columns

Column $I $                         Column $ II$

(Branch of biology)           (Field ofstudy)

$A$ Palynology                  $p$ Silkworms

$B$ Oncology                     $q$ Pollens

$C$ Phycology                    $r$ Cancer

$D$ Sericulture                   $s$ Algae

Two zoogeographical regions separated by high mountain ranges are