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
There are hard dark brown lesions on the labial surface of all four primary cuspids in  seven year old child, the teeth are not painful and scraping with spoon excavator  yields only a few ﬂecks of dried discoloured dentin. What are these lesions? 
Select and explain. 
A. Active carious lesions, B. Arrested carious lesions, C. Local enamel hypoplasia, D. Abrasion
B: Arrested carious lesions
Answer: B: Arrested carious lesions 
Explanation: Arrested caries
With the shift in the oral conditions, even ad­vanced lesions may become arrested. Arrested caries involving dentin shows a marked brown pigmentation and induration of the lesion . There are hard dark brown lesions, the teeth are not painful and scraping with spoon excavator yields only a few ﬂecks of dried discoloured dentin.
 
Reference: TEXTBOOK Of PEDODONTICS Shobha Tandon page no 180