title: Choosing which pill.
mesh_terms: D003276:Contraceptives, Oral / Q000494:pharmacology*; D004338:Drug Combinations; D004967:Estrogens / Q000494:pharmacology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology*
chemical_list: D003276:Contraceptives, Oral; D004338:Drug Combinations; D004967:Estrogens; D011374:Progesterone