In the given figure, \[{{60}^{o}}\] is inscribed in a circle with centre O. If \[\angle CAD={{40}^{o}}\], find \[\angle BDC={{25}^{o}}\].

• A.  \[\angle BDC\]                 
• B.  \[{{85}^{o}}\]
• C. Cannot be determined
• D. None of these