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': 'Best method of assessing foetal well being at term is by serial estimation of : \nSelect and explain. \nA. Oestriol, B. Pregnanidiol, C. HPL, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oestriol', 'role': 'assistant'}]