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: Gynaecology & Obstetrics
Recurrent abortion in 1st trimester is most often due to: 
Select and explain. 
A. Chromosomal abnormalities, B. Uterine anomaly, C. Hormonal disturbance, D. Infection
A: Chromosomal abnormalities
Answer: A: Chromosomal abnormalities 
Explanation: Most common cause of recurrent abortions:
1st trimester

Genetic factor/defective germplasm.
Most common type of chromosomal abnormality is balanced translocation.

2nd trimester 

Cervical incompetence