The correct answer is choice C. Pancreas. Gestational diabetes is a type of diabetes that develops during pregnancy and affects how the cells use sugar (glucose). Glucose is the main source of energy for the body and it is regulated by a hormone called insulin, which is produced by the pancreas.

In gestational diabetes, the placenta (the organ that connects the baby to the mother) produces hormones that can make insulin less effective, leading to high blood sugar levels. This condition is called insulin resistance

Choice A is wrong because the lungs are not directly involved in glucose metabolism or insulin production.

Choice B is wrong because the kidneys are not the primary site of insulin production, although they can be affected by high blood sugar levels over time.

Choice D is wrong because the liver is not the main source of insulin, although it can help regulate blood sugar levels by storing and releasing glucose as needed.

Gestational diabetes usually does not cause any symptoms, but it can increase the risk of complications for both the mother and the baby, such as high blood pressure, pre-eclampsia, large birth weight, premature delivery, low blood sugar, and future diabetes Therefore, it is important to screen for gestational diabetes during pregnancy and manage it with a healthy diet, exercise, and medication if needed