Which of the following descriptions about congenital hypothyroidism is wrong?

A、A Serum Tg concentration below the detection threshold is highly suggestive of athyreosis or a complete Tg synthesis defect ;
B、If TSH>20mU/L, primary hypothyroidism is suspicious;
C、Cholesterol level is usually decreased;
D、Anemia is common;
E、TRH Stimulation Test is used to differentiate hypothalamic or pituitary hypothyroidism