Question

Which words in the sentence make up the appositive phrase? Which word does the appositive rename? Drink this, a mug of hot tea, for your sore throat.
a. Drink this; renames mug
b. a mug of hot tea; renames this
c. of hot tea; renames mug
d. for your sore throat; renames tea

Answer 1

b. a mug of hot tea; renames this

Appositive is noun or noun phrase in which retitles, renames and helps describe the noun that is adjacent to it in the sentence. The appositive is like a more clear illustration or wants to illuminate the said subject in the statement. 
1.          The appositive word in the sentence is the author. Which describes and renames Gary Jackson in the sentence  
2.           It renames Charles Dickens.