This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
A 26 year old third gravida mother delivered a male baby weighing 4–2 kg at 37 weeks of gestation through an emergency caesarean section, for obstructed labour. The child developed respiratory distress one hour after birth. He was kept nil per orally (NPO) and given intravenous fluids. He maintained oxygen saturation on room air. No antibiotics were given. Chest radiograph revealed fluid in interlobar fissure. Respiratory distress settled by 24 hours of life. What is the most likely diagnosis ? 
Select and explain. 
A. Transient tachypnea of the newborn, B. Meconium aspiration syndrome, C. Persistent fetal circulation, D. Hyaline membrane disease
A: Transient tachypnea of the newborn
Answer: A: Transient tachypnea of the newborn 
Explanation: Respiratory distress, which resolves within 24 hours without any respiratory support and fluid in interlobar fissure on chest X-ray suggest the diagnosis of TTN.