This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
[{'content': 'Which or face presentation? \nSelect and explain. \nA. Anencephaly, B. Contracted pelvis, C. Placenta prae, D. Thyroid swelling', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fetal factors anencephaly and iniencephaly Cord around the neck Tumours of neck like congenital goitre Spasm of sternocleidomastoid muscle Dolicocephalic head (refer pgno:370 Sheila textbook of obstetrics 2 nd edition)', 'role': 'assistant'}]