The Difference Between Constant-Dose and Triphasic Combination Pill Is That

The difference between constant-dose and triphasic combination pill is that the

A) constant-dose pill is taken every day of the month.
B) constant-dose pill has fewer side effects than the triphasic pills.
C) contraceptive effect is more easily reversible in the constant-dose pill.
D) hormone dosage is lower in the constant-dose pill.
E) amount of estrogen and progestin in active constant-dose pills is the same, whereas the amounts vary among active doses in triphasic pills.