This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis in obstetrics, Subject name: Gynaecology & Obstetrics
Best confirmation for pregnancy at six weeks: 
Select and explain. 
A. USG for cardiac activity, B. Doppler, C. estimation of serum beta-hCG, D. Bimanual palpation
A: USG for cardiac activity
Answer: A: USG for cardiac activity 
Explanation: In pregnant woman undergoing TVS Gestational sac :4 and half weeks yolk sac :5 weeks fetal node :5 and half weeks fetal hea :6weeks TEXTBOOK OF OBSTETRICS,SHEILA BALAKRISHNAN,Pg no:475,2nd edition