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': "Which of the following is not a parameter in Bishop's score: March 2009 \nSelect and explain. \nA. Cervical consistency, B. Station of head, C. Position of head, D. Cervical length", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Position of Head', 'role': 'assistant'}]