A. front bone
B. spine
C. back
D. B & C both

Explanation:

The word backbone literally means the spine or vertebral column, the series of bones running down the back.

In simple words: spine.

Real-Life Example

• The doctor examined his backbone after the accident.
• The doctor examined his spine after the accident.

Backbone = Spine

Main Points for Exams

• Backbone means the spine or vertebral column.
• Spine is its correct synonym.
• Back is related but not an exact synonym.
• Therefore, Option B is correct.
• Frequently asked in PPSC, FPSC, CSS, PMS, NTS, IELTS, and TOEFL vocabulary tests.

Quick Memory Trick

🦴 Backbone = Spine
🏥 Doctor checks the spine, not just the back.

Backbone ↔ Spine ✔️