A patient underwent surgery in the posterior triangle of the neck 3 weeks ago. He now presents with difficulty elevating the arm above shoulder level and difficulty shrugging the shoulder. Which of the following nerve is most likely injured?

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NBE does not officially release NEET PG papers per the 2025 Supreme Court directive. This question was reconstructed from 1 community source: Collegedunia NEET PG 2026 Memory-Based Paper. Cross-verified by Claude Haiku 4.5 + Gemini 2.5 Flash + community-aggregate vote, then reviewed by a practising medical SME.

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