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
All of the following are true about transient tachypnea of newborn except- 
Select and explain. 
A. It is a self limiting disease, B. It may occur after Caeserean section, C. It usually takes 1 month to recover, D. It is due to slow absorption of fetal lung fluid
C: It usually takes 1 month to recover
Answer: C: It usually takes 1 month to recover 
Explanation: Transient tachypnea of Newborn o Transient tachypnea of the newborn is a benign self-limiting disease occurring usually in term neonates and is due to delayed clearance of lung fluid.
It is also called respiratory distress syndrome type II.
TTN follows -

Uneventful normal preterm or term vaginal delivery
Cesarean delivery
TTN is believed to be secondary to slow absorption of fetal lung fluid resulting in decreased pulmonary compliance and tidal volume and increased dead space therefore
also known as wet lung
Clinical manifestations o Early onset of tachypnea
Sometimes retraction or expiratory grunting
Occasionally cyanosis
Patients usually recover rapidly within 3 days
Hypoxemia, hypercapnia and acidosis are uncommon.
The lungs are generally clear without rales or rhonchi and chest roentgenogram shows  
Prominent pulmonary vascular markings o Fluid lines in the fissure o Prominent inter-labar fissure
Overaeration) Flat diaphragm o Occasionally pleural fluid.