Which word means 'required, obligatory, something you have to do'?

• A. Indemnification
• B. Acetaminophen
• C. Mandatory
• D. Tuberculosis

Answer: (C)

When you need a word that signals something you must do because of rules or an authority, the right choice is a term that conveys obligation. Mandatory fits perfectly because it describes requirements set by rules, laws, or official policies—and it means not optional. For example, attendance at the orientation is mandatory, or wearing a helmet is mandatory in this area. This emphasis on obligation is what makes it the best match.

The other options don’t fit the idea of obligation: one refers to compensation for losses (indemnification), another is a common pain-relief medicine (acetaminophen), and the last is a disease (tuberculosis).