Step 1: Understanding the relationship between "PAIN" and "SEDATIVE".
The relationship between "PAIN" and "SEDATIVE" is that a sedative is a substance used to relieve pain or calm someone. In the same way, a narcotic is used to relieve or induce a trance-like state.
Step 2: Analyzing the options.
(A) comfort : stimulant: This does not have a similar relationship. A stimulant does not comfort.
(B) grief : consolation: While consolation helps with grief, it is not the same type of relationship as "PAIN" and "SEDATIVE."
(C) trance : narcotic: Correct — A narcotic is used to induce a trance-like state, similar to how a sedative is used to reduce pain.
(D) ache : extraction: This is not the correct relationship. Extraction does not directly relate to an ache.
Step 3: Conclusion.
The correct answer is (C) trance : narcotic, as it follows the same pattern as "PAIN : SEDATIVE".