Which of the following is NOT one of the three most common drugs given to women with CD in pregnancy?

In the context of managing Crohn's disease (CD) in pregnancy, the focus is generally on medications that help control inflammation and maintain remission, while also considering safety for both the mother and the developing fetus. The three drugs commonly used for women with Crohn's disease during pregnancy typically include corticosteroids, immunomodulators, and anti-TNF agents.

Antibiotics are not typically among the first-line treatments for managing Crohn's disease, especially in a pregnancy setting. They might be used occasionally if there is an associated infection or specific complications arising, but they are not routinely administered as part of the management plan for Crohn's disease itself.

On the other hand, diuretics may be used to manage fluid retention, heparin is often employed to prevent thromboembolic events particularly in women with inflammatory conditions, and digitalis may be used for heart-related issues. The distinction here lies in the typical management of Crohn's disease in pregnancy, where antibiotics rank lower in terms of standard treatment protocols, making them the least likely of the listed medications to be commonly used for or associated with management of this particular condition during pregnancy.