Which option is listed on the DOT indicative list?

• A. Category A substance
• B. Category B substance
• C. UN1845
• D. Infectious substance label

Answer: (A)

The concept being tested is recognizing what the DOT indicative list uses as an example to identify dangerous goods. This list provides broad, everyday terms that point to specific dangerous goods classifications without needing a precise UN number.

Infectious substances are divided into two categories for transport: Category A and Category B. On the DOT indicative list, you’ll see a general entry for a “Category A substance,” which is used as a representative example of the most strictly regulated infectious materials requiring UN2814 or UN2900 packaging and strict handling and labeling. The other options don’t serve as the indicative-list entry in the same way: a specific UN number like UN1845 isn’t the illustrative item from the list, the infectious substance label is a labeling element rather than a shipping name, and while Category B is a real classification, it isn’t the listed example used on that particular indicative list.