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
[{'content': "At how many weeks of gestation can Hegar's sign be elicited? \nSelect and explain. \nA. 8 weeks, B. 10 weeks, C. 12 weeks, D. 15 weeks", 'role': 'user'}, {'content': "Answer: A \nExplanation: Hegar's sign refers to widening and softening of of the body or isthmus of the uterus. It usually occurs at 6-8 weeks of gestation. Softening and dilatation at the external os is caused by estrogen and progesterone. Chadwick's sign: It refers to bluish discoloration of cervix caused by congestion of pelvic vasculature. It is a presumptive sign of pregnancy. Jacquemier's sign: It refers to congested appearance of vaginal mucosa. Osiander's sign: It refers to increased pulsations felt in the lateral fornices at 8 weeks of gestation. Goodell's sign: It refers to softening of the cervix. Palmer's sign: refers to intermittent contractions of the uterus. Ref: Bernstein H.B., VanBuren G. (2013). Chapter 6. Normal Pregnancy and Prenatal Care. In A.H. DeCherney, L. Nathan, N. Laufer, A.S. Roman (Eds),CURRENT Diagnosis & Treatment: Obstetrics & Gynecology, 11e. Manual Of Obstretics, 3/e By Daftary page 54", 'role': 'assistant'}]