Mark against the correct answer in the following:

Mark $(\sqrt{ })$ against the correct answer in the following:

$\int_{0}^{\pi / 2} \frac{\sqrt[3]{\tan x}}{(\sqrt[3]{\tan x}+\sqrt[3]{\cot x})} d x=?$

A. 0

B. $\frac{\pi}{2}$

C. $\frac{\pi}{4}$

D. $\pi$