This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
[{'content': 'Longest diameter is - \nSelect and explain. \nA. BPD, B. Suboccipitobregmatic, C. Mentovertical, D. Submentobregmatic', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Mentovertical* Biparietal diameter - 9.5 cm* Mentovertical diameter - 13.5 cm* Bitemporal diameter - 8 cm* Submentovertical diameter - 11.5 cm* Bimastoid diameter - 7.5 cm* Submentobregmatic diameter - 9.5 cm* Suboccipito-Bregmatic diameter - 9.5 cm* Occipitofrontal diameter - 11.5 cm* Suboccipito-Frontal diameter - 10 cm", 'role': 'assistant'}]