Which of the following description of sweat glands is wrong ?

A、The ducts of merocrine sweat gland open at the sweat pore of the skin surface. ;

B、The secretory portion of merocrine sweat glands is composed of stratified cuboidal epithelium.;

C、The secretion of merocrine sweat gland mainly contains water, sodium chloride, urea and uric acid. ;

D、The secretion of apocrine sweat gland is regulated by sex hormone.