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: Forensic Medicine
Most accurate method of diagnosis of pregnancy at 6 weeks: AIIMS 13; JIPMER 14 
Select and explain. 
A. Hegar's sign, B. X-ray examination, C. Palpation of fetal pas, D. Fetal hea sound by USG
D: Fetal hea sound by USG
Answer: D: Fetal hea sound by USG 
Explanation: Ans. Fetal hea sound by USG