The truth is that whenever l eat an orange or a pear, l get very thirsty. Which word is the definite article?
In a sentence you can find :
definite articles (which specify what you is being referred to) and
indefinite articles (which refer to any of the items referred to)
Definite is "the", indefinite is "a, or an".
In 'Please give me the book. ' there is only ONE book being referred to.
In 'Please give me a book, it is a general request - any book will do..
In your sentence. The truth means that there is only one true statement being referred to ... eating any orange or any pear refer to any item of the two types of fruit mention.
This can even be seen in the question itself....
Which word is 'the' definite article.