This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acyanotic Congenital Heart Disease, Subject name: Pediatrics
[{'content': 'ASD which is common - \nSelect and explain. \nA. Patent foramen ovale, B. Ostiumprimum, C. Ostiumsecondum, D. Sinusvenosus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i,e., Ostium secondum o ASD can occur in any portion of atrial septum -SecundumPrimumSinus venosusAbsent atrial septum (leads to single atrium)o Ostium secondum defectDefect in region of fossa ovalisMost common form of ASD", 'role': 'assistant'}]