Gynaecology & Obstetrics Most common abnormality for 1st trimester aboion is : A Trauma B Placental and membrane abnormalities C Chromosomal abnormalities/ Germ plasm de fect D Retroversion 💡 Explanation Most common abnormality for 1st trimester aboion is : ✓ Correct Answer: C. Chromosomal abnormalities/ Germ plasm de fect