【正确答案】 E

【答案解析】The relationship that exists between pilot and jet can be expressed with the following sentence: "A pilot is a human who controls a jet, directing it where to go." Eliminate answer choices B and D because the first word does not refer to a human. A physician does not necessarily control or direct health, so answer choice C can also be eliminated. A conductor controls and directs an orchestra, so this choice best expresses the relationship that exists between the words in the question stem.