The nurse is caring for a client who is 21-weeks pregnant and requires the administration of various medications. The nurse understands that different medications are classified on their potential interaction with the mother's fetus. From the list of options below, match the correct medication category to its corresponding description.

A. Category A:
Medications classified as Category A are considered the safest during pregnancy. They have been well-studied in pregnant humans, and no risk to the fetus has been demonstrated. This classification means that adequate and well-controlled studies have shown no evidence of harm to the fetus in the first trimester and no risk in later trimesters.

B. Category C:
Category C medications have shown potential risks to the fetus in animal studies, and there are no well-controlled studies in humans. The benefits of the medication may outweigh the potential risks, but caution is advised. These medications are used when the potential benefits justify the potential risks to the fetus.

C. Category X:
Category X medications are contraindicated in pregnancy due to evidence of fetal abnormalities or risks that outweigh any potential benefits. These medications have demonstrated clear evidence of harm to the fetus in both human and animal studies, and their use is not recommended during pregnancy.

D. Category B:
Category B medications have shown no risk to animal fetuses, but there is a lack of adequate and well-controlled studies in pregnant humans. The absence of evidence of harm in animal studies suggests that these drugs are generally considered safe, though their effects on human fetuses are not well-documented.

A) Palliative therapy: Palliative therapy is aimed at providing relief from symptoms and improving the quality of life in patients with serious or terminal illnesses. It does not pertain to the use of antibiotics before culture results are available.

B) Prophylactic therapy: Prophylactic therapy is used to prevent the occurrence of an illness or infection before it happens. For example, antibiotics given before surgery to prevent infections would be considered prophylactic therapy, but this is not the case here.

C) Maintenance therapy: Maintenance therapy is used to sustain a desired level of therapeutic effect after an initial treatment phase. It focuses on keeping a condition under control rather than addressing an acute or uncertain condition.

D) Empiric therapy: Empiric therapy refers to the use of antibiotics or other medications based on clinical judgment and initial symptoms before the results of diagnostic tests, such as wound cultures, are available. This approach is used to start treatment promptly and manage the infection while awaiting precise identification of the pathogen.