男，55岁。颈部淋巴结进行性肿大2个月，发热2周。发病以来体重减轻14Kg。查体：T38.7℃，双侧颈部和右腋窝均有数个直径2～5cm大小淋巴结，均活动，无压痛，心肺未见异常，腹平软，肝脾肋下未触及，血常规和骨髓检查均未见异常。左颈部淋巴结活检确诊为弥漫性大B细胞淋巴瘤。为判断该患者淋巴瘤诊断是A组或B组，还应询问的病史是
C
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