This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Pediatrics
[{'content': 'Number of primary teeth; \nSelect and explain. \nA. 20, B. 24, C. 16, D. 32', 'role': 'user'}, {'content': 'Answer: A \nExplanation: there are total of 20 primary teeth PRIMARY/ MILK/ TEMPORARY TEETH SECONDARY/ PERMANENT TEETH BEGIN AT 6-7 months 6 years 1st tooth to erupt Lower central incisor 1st molar Last tooth Second molar 3rd molar or wisdom tooth Completes at 2 and half - 3 years 12 years except the 3rd molar Total no. of teeth 20 28-32', 'role': 'assistant'}]