Answer: D

Reasoning: Under the WHO Oral Health Surveys – Basic Methods (1986) criteria for the DMFT index, any tooth that carries a temporary (“interim”) restoration is recorded in the D (decayed) category rather than the F (filled) category. A temporary filling is taken to indicate that active disease is still present and definitive treatment is pending; therefore the tooth is classified simply as “decayed” [Moller & Beck, 1976, PMID 786900].