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': 'Non-verbal communication means \nSelect and explain. \nA. Smiling., B. Eye contact., C. Both., D. None.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Communication: 2 types - verbal and non-verbal.\nVerbal communication is best for younger children more than 3 years of age. Voice that is used should be constant and gentle. Tone of voice can express empathy and firmness.\nNon-verbal communication is by body language - smiling, eye contact, by touching the child or by giving a hug.', 'role': 'assistant'}]