Final answer:
Option B. Insulin Isophane Suspension NPH (Humulin N, Novolin N) falls into Category B for pregnancy. This indicates that no evidence of risk has been found in animal studies and there is a lack of human studies, or that human studies have not shown fetal risk.
Step-by-step explanation:
The pregnancy category for Insulin Isophane Suspension NPH (Humulin N, Novolin N) is Category B. This categorization indicates that studies in animals have not shown a risk to the fetus, and there are no adequate and well-controlled studies in pregnant women, or animal studies have shown an adverse effect, but adequate and well-controlled studies in pregnant women have failed to demonstrate a risk to the fetus in any trimester.
Insulin, including NPH (Neutral Protamine Hagedorn), is considered the standard treatment for controlling blood sugar in pregnant women with diabetes because poorly controlled diabetes increases the risk for birth defects and other problems for the baby. In general, insulin is regarded as safe for use during pregnancy because it does not cross the placenta to a significant extent.