Find the sixth term of the expansion $(y^{\Large\frac{1}{2}}+x^{\Large\frac{1}{3}})^n$.If the binomial coefficient of the third term from the end is 45.

Question

$\begin{array}{1 1}(A)\;252 y^{\Large\frac{5}{2}}x^{\Large\frac{5}{3}}\\(B)\;252\\(C)\;y^{\Large\frac{5}{2}}x^{\Large\frac{5}{3}}\\(D)\;200y^{\Large\frac{5}{2}}\end{array}$