Question

(i)
The person
is most likely to get
the gold medal is my sister.​

Answer 1

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Answer 2

The correct form of the given sentence is as follows:-

The person  who is most likely to get  the gold medal is my sister.​

• the sentence describes one person, the speaker's sister, who is going to get the gold medal most probably
• who is a relative pronoun used here to indicate the subject, the person, or the speaker's sister
• who is always used in the case of a person. Here it is for a noun and as a joining conjunction for sub clauses.