Gynaecology & Obstetrics Spontaneous abortion in 1st trimester is caused by:a) Trisomy 21b) Monosomy c) Traumad) Rh-incompatibility A ab B bc C acd D abc 💡 Explanation Spontaneous abortion in 1st trimester is caused by:a) Trisomy 21b) Monosomy c) Traumad) Rh-incompatibility ✓ Correct Answer: D. abc