Fill in the blank with the appropriate direct or indirect object pronoun. est-ce que tu dis la verité à tes parents ? oui je dis la verité .

Unlike English, other romance languages such as Spanish or French categorize words on the basis of gender distinctions, and the genderization is also applied to articles and object pronouns accordingly; in the case of "The Truth" which has no gender in English, it's categorized feminine in Spanish (La Verdad), and feminine in French (la verité). The suitable answer to that question then would be:

"Oui, je la leur dis".