With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: By the time the Jaggerz regrouped in 1989, Iris was well into his solo career, and Ross became the sole lead vocalist and remained bassist.
text_B: By the time the Jaggerz regrouped in 1989, Gunnar Graarud was well into his solo career, and Ross became the sole lead vocalist and remained bassist.
contradiction.