With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Muppet Christmas Carol is a film about Christmas.
text_B: The inferior alveolar nerve -LRB- sometimes called the inferior dental nerve -RRB- is a branch of the mandibular nerve , which is itself the third branch of the trigeminal nerve .. mandibular nerve. mandibular nerve. trigeminal nerve. trigeminal nerve. The inferior alveolar nerves supply sensation to the lower teeth .
not_related.