This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Prenatal Diagnosis, Subject name: Gynaecology & Obstetrics
After bih which of the following changes occur in the fetus? 
Select and explain. 
A. The foramen ovale closes allowing the entire blood volume to circulate into the pulmonary vein, B. Lung fluid is forced out of the fetal alveoli with the first few breaths, C. The ductus aeriosus opens, D. The umbilical vein and aery remain functional for several weeks
B: Lung fluid is forced out of the fetal alveoli with the first few breaths
Answer: B: Lung fluid is forced out of the fetal alveoli with the first few breaths 
Explanation: - The foramen ovale closes allowing the entire blood volume to circulate into the pulmonary aery - The foramen ovale, the ductus aeriosus and the umbilical veins and aeries close within a few hours of bih. - Lung fluid is forced out of the fetal alveoli with the first few breaths