The differential coefficient of\[{{x}^{6}}\] with respect to \[{{x}^{3}}\] is [EAMCET 1988; UPSEAT 2000]

• A. \[5{{x}^{2}}\]
• B. \[3{{x}^{3}}\]
• C. \[5{{x}^{5}}\]
• D. \[2{{x}^{3}}\]