This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis of Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': "Which of the following includes the classical triad of enlarged upper part of uterus, soft lower part of body and firm cervix 'during early pregnancy? \nSelect and explain. \nA. Hegar's sign, B. Jacquemier's sign, C. Osiander's sign, D. Goodell's sign", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A. Hegar's signHegar's sign 'enlarged upper part of uterus, soft lower part of body and firm cervix 'during early pregnancySigns of Early Pregnancya. Jacquemier's or Chadwick's sign (eighth week): Dusky hue of vestibule and anterior vaginal wall.b. Osiander's sign (eighth week): Increased pulsations felt through lateral Fornices.c. Goodell's sign (sixth week): Softening of cervix.", 'role': 'assistant'}]