What invention is John Boyd Dunlop, often written as J. B. Dunlop, famous for introducing?

Introduction / Context:
This question is from the inventions section of general knowledge and focuses on J. B. Dunlop, a well known name in the history of transport technology. Dunlop is associated with a key improvement to wheels that made riding bicycles and vehicles much smoother and more comfortable: the pneumatic rubber tire. Knowing this association is important for exams that ask about inventors and their major contributions.

Given Data / Assumptions:

• The inventor named in the question is J. B. Dunlop.
• The options include pneumatic rubber tire, automobile wheel rim, rubber boot and model airplanes.
• The question asks which invention is linked to Dunlop.
• Standard general knowledge sources are assumed to be the reference.

Concept / Approach:
Dunlop, whose full name is John Boyd Dunlop, is generally credited with developing the practical pneumatic tire in the late nineteenth century for his child's bicycle to reduce discomfort from solid wheels. The pneumatic tire uses pressurised air inside a rubber casing, giving better cushioning and control. While automobile wheel rims and model airplanes are important in vehicle technology and aviation, they are not the core invention associated with Dunlop in popular knowledge. Rubber boots are also unrelated to his main achievement.

Step-by-Step Solution:
Step 1: Recall that the name Dunlop appears frequently in connection with tires and that Dunlop brand tires are widely known even today. Step 2: Understand that the key improvement Dunlop introduced was the pneumatic tire, in which air is pumped into a rubber tube or casing surrounding the wheel. Step 3: Compare this recollection with the list of options. Step 4: Option A explicitly mentions the pneumatic rubber tire, which matches the known historical contribution. Step 5: Recognise that automobile wheel rims, rubber boots and model airplanes are either too general or linked to other inventors and industries. Step 6: Therefore, choose pneumatic rubber tire as the correct answer.

Verification / Alternative check:
To verify, recall that modern bicycles, motorbikes and cars usually use pneumatic tires, and Dunlop is often mentioned in histories of cycling and automotive technology as a pioneer. Many companies carry the Dunlop brand name in the tire industry. The other options lack this strong historical and commercial association. This confirms that the pneumatic tire is the invention related to Dunlop.

Why Other Options Are Wrong:
The automobile wheel rim is a necessary component but does not represent Dunlop's main invention. Rubber boots are everyday items and do not match the famous technical innovation described. Model airplanes relate to aviation hobby and demonstration but are not the subject of Dunlop's well known work. None of these options matches the transformative impact of the pneumatic tire on everyday transport, which is why they are incorrect here.

Common Pitfalls:
Learners sometimes confuse different parts of vehicles and assume that any component related to wheels must be associated with the same inventor. Another mistake is to ignore brand names they see in daily life; many have historical roots in inventions. Recognising the Dunlop name on tires and connecting it with pneumatic rubber tires helps fix this question in memory and avoids confusion in the exam hall.

Final Answer:
J. B. Dunlop is famous for introducing the Pneumatic rubber tire.