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': "Mandible is derived from ? \nSelect and explain. \nA. Meckle's cailage, B. Ritchers cailage, C. 4th Pharyngeal pouch, D. 6th Pharyngeal pouch", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Meckle's cailageEach half of the mandible ossifies from only one centre which appears at about the 6th week of intrauterine life in the mesenchymal sheath of Meckels cailage near the future mental foramen. Meckle's cailage is the skeletal element of first pharyngeal arch.", 'role': 'assistant'}]