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: Unknown
Cause of recurrent missed abortion at 10 weeks - 
Select and explain. 
A. Chromosomal abnormality, B. Cervical incompetence, C. Corpus luteum failure, D. Retroverted uterus
A: Chromosomal abnormality
Answer: A: Chromosomal abnormality 
Explanation: Ans-A