Which of the following sexually transmitted infections is caused by a bacterium called Neisseria gonorrhoeae, often produces no symptoms, but can be treated with antibiotics? If symptoms occur, they may include painful urination and discharge from the penis or vagina. If left untreated, the infection can result in more serious long-term problems, including infertility, pain, and joint problems.

Choice A reason: This is incorrect. Decreased production of erythrocytes (red blood cells) is a consequence, not a cause, of iron deficiency anemia. Iron is needed to make hemoglobin, the protein that carries oxygen in the red blood cells. Without enough iron, the body cannot produce enough hemoglobin or red blood cells¹.

Choice B reason: This is correct. Inadequate intake of iron is the most common cause of iron deficiency anemia during pregnancy. Pregnant women need more iron than nonpregnant women to support the increased blood volume and the fetal growth. If the dietary intake of iron is not sufficient, the body will use up its iron stores, leading to iron deficiency anemia.

Choice C reason: This is incorrect. Dilution of hemoglobin concentration is a normal physiological change during pregnancy, not a cause of iron deficiency anemia. The blood volume increases by 20% to 30% during pregnancy, while the red blood cell mass increases by only 15% to 20%. This results in a lower concentration of hemoglobin in the blood, but not necessarily a lower amount of hemoglobin or iron³.

Choice D reason: This is incorrect. The fetus establishing iron stores is not a cause of iron deficiency anemia during pregnancy, although it can contribute to it. The fetus needs iron for its own development and growth, and it obtains iron from the mother through the placenta. The fetal iron demand increases in the second and third trimesters, when the fetus accumulates iron in its liver and other tissues. This can deplete the maternal iron stores, especially if the mother does not consume enough iron.

Choice A reason: Poor maternal weight gain is a risk factor for IUGR, as it indicates inadequate nutrition and fetal growth.

Choice B reason: Premature rupture of membranes is not a risk factor for IUGR, as it does not affect the placental function or blood flow. It is a complication of pregnancy that can lead to infection, preterm labor, or cord prolapse.

Choice C reason: Smoking is a risk factor for IUGR, as it reduces the oxygen and nutrient delivery to the fetus and causes vasoconstriction of the placental vessels.

Choice D reason: Gestational hypertension is a risk factor for IUGR, as it impairs the placental perfusion and causes fetal hypoxia and acidosis.