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: Forensic Medicine
Most common cause of first trimester aboion is: UP 09; JIPMER 10; Kerala 11; AFMC 12; CMC (Vellore) 14; COMEDK 15 
Select and explain. 
A. Chromosomal defect, B. Endocrine disturbances, C. Anatomic abnormality of uterus, D. Infections
A: Chromosomal defect
Answer: A: Chromosomal defect 
Explanation: Ans. Chromosomal defect