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
A 6 year old male patient came for a routine dental checkup. Patient is a known case of autism. Intraoral examination reveals restoration with right mandibular first molar. Radiographic finding suggests secondary caries visible beneath the restoration. This child will be considered under which of the following category? 
Select and explain. 
A. High risk, B. Low risk, C. Moderate risk, D. Very high risk
C: Moderate risk
Answer: C: Moderate risk 
Explanation: Caries-Risk Assessment Form for Children 6 Years Old or Younger