In this analogy question about professions and workplaces, Scientist is related to Laboratory, so you must select the place that stands in the same relation to Astronomer from the given alternatives.

Introduction / Context:

This is a profession-and-workplace analogy. The pair "Scientist : Laboratory" links a profession with the place where that professional typically performs experimental or research work. Your task is to determine which location is similarly related to an astronomer, who studies celestial objects such as stars, planets and galaxies.

Given Data / Assumptions:

- A scientist generally conducts experiments and research in a laboratory.
- An astronomer specialises in studying celestial bodies and cosmic phenomena.
- Options: Garage, Battlefield, Observatory, Hospital and Library.
- We assume standard professional contexts, not unusual or metaphorical meanings.

Concept / Approach:

The underlying relationship is "professional : typical primary workplace." A laboratory is the main work environment for many scientists. For an astronomer, the equivalent specialised workplace is the observatory, where telescopes and other instruments are installed for systematic observation of the sky. While astronomers may also work in offices or universities, the observatory is the most precise answer that parallels the laboratory in the original pair.

Step-by-Step Solution:

Verification / Alternative check:

We can verify by forming similar descriptive sentences. "A scientist works in a laboratory" and "An astronomer works in an observatory" are both clear and accurate. If we try similar sentences with other options such as "An astronomer works in a battlefield" or "An astronomer works in a garage", they become obviously incorrect. This confirms that the observatory is the correct workplace corresponding to the astronomer in the analogy.

Why Other Options Are Wrong:

Garage is associated with mechanics who repair vehicles, not with astronomical observation.

Battlefield is related to soldiers and military operations, not scientific sky observation.

Hospital is primarily associated with medical professionals like doctors and nurses, not astronomers.

Library is a place for reading and research in general, but it is not the specific professional workplace for practical astronomical observation, unlike an observatory.

Common Pitfalls:

Some candidates might be tempted by the word library because astronomers and scientists both read and research. However, libraries are support environments common to many professions. The analogy demands a specialised workplace, just as a laboratory is specialised for scientists. Another pitfall is not focusing on the profession at all and instead making a guess based on familiarity of words.

Final Answer:

The workplace that correctly completes the analogy is Observatory, giving the pair "Astronomer : Observatory".