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: Anatomy
[{'content': 'Which out of the following bones ossify first? \nSelect and explain. \nA. Mandible, B. Nasal bone, C. Vomer, D. Occipital', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mandible is the second bone, next to clavicle, to ossify in the body.\xa0\nIt ossifies in membrane in its greater part. Each half of the body of mandible is ossified in membrane from 1 centre, which appears during 6th week I.U. near future mental foramen.\nThe parts ossifying in cartilage includes,\n\t\nIncisive part, below the incisor teeth.\nUpper half of ramus, above the level of mandibular foramen.\nCondylar process.\nCoronoid process.', 'role': 'assistant'}]