Mark against the correct answer in each of the following:

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

$\int \frac{d x}{(1-\cos 2 x)}=?$

A. $\frac{1}{2} \cot \mathrm{x}+\mathrm{C}$

B. $2 \cot x+C$

C. $-\frac{1}{2} \cot x+C$

D. $-2 \cot x+C$