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
In morbus caeruleus foramen ovale closes after - 
Select and explain. 
A. 6 months, B. 2 years, C. 1 year, D. Never
D: Never
Answer: D: Never 
Explanation: Ans. is 'd' i.e., NeverIn few cases foramen ovale remains patent throughout life give rise to cyanosis, a condition called morbus caeruleus.