Which of the following SSIC numbers represents a secondary subject?

Which of the following SSIC numbers represents a secondary subject?

• A. 5200
• B. 5210
• C. 5220
• D. 5230

Answer: (B)

SSIC codes are hierarchical, with trailing digits signaling how the topic is refined and whether it's a secondary subject within a broader area. Within a given 52xx family, the last two digits indicate the specific subtopic, and 10 is used to denote a secondary subject. That’s why the number ending in 10 fits as the secondary subject. The other options end in 00, 20, or 30, which do not carry the secondary-subject designation, so they don’t represent a secondary topic.

SSIC codes are hierarchical, with trailing digits signaling how the topic is refined and whether it's a secondary subject within a broader area. Within a given 52xx family, the last two digits indicate the specific subtopic, and 10 is used to denote a secondary subject. That’s why the number ending in 10 fits as the secondary subject. The other options end in 00, 20, or 30, which do not carry the secondary-subject designation, so they don’t represent a secondary topic.