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: Gynaecology & Obstetrics
Fetal cardiac activity is detected with Transvaginal USG as early as? 
Select and explain. 
A. 6 weeks, B. 8 weeks, C. 10 weeks., D. 12 weeks
A: 6 weeks
Answer: A: 6 weeks 
Explanation: 6weeks REF: USG in Obstetrics & Gynecology by Callen 4th edition page 119-120 Fetal cardiac activity is detected as early as With Transvaginal USG 6 weeks of gestational age With Transabdominal USG