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: Dental
[{'content': 'S-ECC in a child 2, 3 or 4 years of age is characterized by: \nSelect and explain. \nA. Early involvement of maxillary and mandibular molars & the mandibular canines, B. Mandibular incisors, maxillary & mandibular molar, C. Mandibular incisors & maxillary canine, D. Mandibular premolars & maxillary premolars', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]