Find the missing term in the following series:
H, I, K, N, ?
[A]O
[B]Q
[C]R
[D]S

R
In the above question, the pattern is
$latex H\xrightarrow{\text{+1}} I \xrightarrow{\text{+2}} K \xrightarrow{\text{+3}}N \xrightarrow{\text{+4}} \textcircled{R} $