This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
[{'content': 'Which of the following are the first incisors to erupt in an infant __________ \nSelect and explain. \nA. Lower central, B. Lower lateral, C. Upper central, D. Upper lateral', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Eruption times vary from child to child. As seen from the cha, the first teeth begin to break through the gums at about 6 months of age. Usually, the first two teeth to erupt are the two bottom central incisors (the two bottom front teeth). Next, the top four front teeth emerge. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]