Gynaecology & Obstetrics Which vitamin deficiency is most commonly seen in a pregnant mother who is on phenytoin therapy for epilepsy? A Vitamin B6 B Vitamin B12 C Vitamin A D Folic acid 💡 Explanation Which vitamin deficiency is most commonly seen in a pregnant mother who is on phenytoin therapy for epilepsy? ✓ Correct Answer: D. Folic acid