Analogy completion — choose the best word to complete the relationship: carpenter : saw, nails :: pediatrician : stethoscope, __

Introduction / Context:
This analogy tests recognition of profession-to-tools relationships. A carpenter typically works with tools like a saw and nails. A pediatrician (a doctor who treats children) similarly uses specialized medical instruments. You must select the instrument that best parallels the tool pattern shown for the carpenter.

Given Data / Assumptions:

• Profession: carpenter → uses saw, nails (tools).
• Profession: pediatrician → uses stethoscope and another appropriate tool.
• We need a second pediatrician tool that fits naturally with stethoscope.

Concept / Approach:
Map each word to its role: profession, tool, patient, condition, or generic category. Maintain the same relation type. 'Stethoscope' is a diagnostic instrument; another common, basic clinical instrument used by pediatricians is a 'thermometer.' Objects like 'baby' (patient), 'doctor' (profession), or 'illness' (condition) do not match the tool-of-the-profession relation required by the pattern.

Step-by-Step Solution:

Verification / Alternative check:
Ask whether the chosen word can be carried in the pediatrician's basic kit for routine examinations. A thermometer, like a stethoscope, is a standard, widely used diagnostic tool, confirming the parallelism.

Why Other Options Are Wrong:

• baby: refers to the patient, not a tool.
• doctor: the profession itself; wrong relation type.
• illness: a condition; not an instrument.
• scalpel: a surgical tool more aligned with surgeons; not typically paired with stethoscope in outpatient pediatrics.

Common Pitfalls:
Confusing the role (person or condition) with instruments. In analogies, keep the relation type consistent: profession → professional tools.

Final Answer:
thermometer