Ancylostoma,also known as $.....(A).....$,belongs to the phylum $.....(B)....$. Identify $A$ and $B$ respectively and choose the correct option.

• A
  $A \rightarrow$ Filarial worm,$B \rightarrow$ Aschelminthes
• B
  $A \rightarrow$ Hookworm,$B \rightarrow$ Aschelminthes
• C
  $A \rightarrow$ Flatworm,$B \rightarrow$ Platyhelminthes
• D
  $A \rightarrow$ Pinworm,$B \rightarrow$ Aschelminthes