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': 'Age and sex of the individual is known by the age of _________ \nSelect and explain. \nA. 24 months, B. 36 months, C. 48 months, D. 60 months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Emerging patterns for language behaviour from 1-5years of age 15months Jargon Follows simple commands May name a familiar object (e.g., ball) Responds to his/her name 18months 10 words (average) Names pictures Identifies 1 or more pas of the body 24months Puts 3 words together (subject, verb, object) 30months Refers to self by the pronoun "I" Knows full name 36months Knows age and sex Counts 3 objects correctly Repeats 3 numbers or a sentence of 6 syllables Most of the speech intelligible to strangers 48months Counts 4 pennies accurately Tells story 60months Names 4 colours Repeats sentence of 10 syllables Counts 10 pennies correctly Ref: Nelson paediatrics; Table 11-1', 'role': 'assistant'}]