The Answer is C.
The <em>physicians and surgeons are professionals</em> that studied many years and dedicated a lot of attention and efforts to learn important scientific knowledge. To practice their profession, they will need <em>additional skills</em> to be able to manage the many aspects of this work: talking with the patients, having an organized office, take important decisions etc.
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Love is the answer you are looking for. Orsino is in love with Olivia. Olivia is in love with Cesario. Viola is in love with Orsino. Therefore your answer is Love.