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
Which of the following is the most common cause of 1st-trimester abortions : 
Select and explain. 
A. Chromosomal deletions, B. Aneuploidy, C. Chromosomal translocation, D. Tetraploidy
B: Aneuploidy
Answer: B: Aneuploidy 
Explanation: Ans- B Aneuploidy Overall most common cause- Aneuploidy Most common cause among Aneuploidy types- Trisomy If both Trisomy and Aneuploidy are mentioned - Aneuploidy is the best answer since Trisomy is a type of Aneuploidy.