In the given figure \[{{270}^{o}}\], O is the centroid of \[{{60}^{o}}\] PQ = 5 cm and QR = 12 cm, then OQ is equal to:

• A.  \[{{300}^{o}}\]                              
• B.  \[{{240}^{o}}\]
• C.  \[{{120}^{o}}\]                  
• D.  \[{{120}^{o}}\]