Question

This is ...boy who stood first in.... Examination
The / a / an

Answer 1

the boy who stood first in examination I have seen the boy

Answer 2

This is the boy who stood first in the Examination.

1. There are three articles in English language: a, an, and the.

2. Such type of articles are always used before any noun or words equivalent to nouns and also those words which are a form of adjective.

3. The article (the) is always defined as the definite article which is used before a noun to determine or to show the identitification of the noun which is known to the listener or reader.

4. The article (a, an) is always defined as the indefinite article which is  usually used before any noun when its identification is not known to us.

5. In some of the situations it happens where a noun takes zero article.