Direction: In the following questions, some of the sentences have errors and some have none. Find out which part of a sentence has an error and indicate appropriate number (1, 2, 3). If there is No error, indicate corresponding number (4) as your answer.
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					 Solve the question according to given instruction
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                        - I know
- a doctor
- you are referring to
- No error
 
Correct Option: B
the will replace a because – 
here, we are talking about a particular/definite/specific doctor. 
The sentence can also be written as – 
I know the doctor who you are referring to.
Rel. Pro. 
Look at the examples given below :
The people I met there were friendly. (Definite – those over there) 
The people (whom) I met there were very friendly. 
 
	