Final answer:
The underlined part of the sentence is known as the subject, key for understanding the focus of the sentence.
Explanation:
The underlined portion of the sentence is known as the subject.
In the sentence provided, the subject is 'the chief surgeon of the hospital' as it is the entity being talked about and performing the action.
Identifying the subject in a sentence is crucial for understanding who or what the sentence is about.
Learn more about Sentence Structure and Grammar here:
https://brainly.com/question/28817307
