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
[{'content': 'Most common cause of first trimester aboion is: UP 09; JIPMER 10; Kerala 11; AFMC 12; CMC (Vellore) 14; COMEDK 15 \nSelect and explain. \nA. Chromosomal defect, B. Endocrine disturbances, C. Anatomic abnormality of uterus, D. Infections', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Chromosomal defect', 'role': 'assistant'}]