问题描述：
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一名64岁男子在倒塌后出现事故和紧急情况。 他描述了一次停电，随后在地板上恢复了意识。 他目前感觉良好，没有其他症状。 但是，他提到自己在过去几个月中无意中减轻了一些体重。 没有过去的病史。 验血显示血红蛋白水平为9 g / dL，平均细胞体积为71 fL。 该患者最适合的下一次检查是：A 64-year-old man presents to accident and emergency following a collapse． He describes a blackout， subsequently regaining consciousness when on the floor． He presently feels well and describes no other symptoms． However， he mentions that he has unintentionally lost some weight over the past few months． There is no past medical history． Blood tests reveal a haemoglobin level of 9 g/dL with a mean cell volume on 71 fL． The most appropriate next investigation of this patient is:
A．内窥镜和结肠镜检查Endoscopy and colonoscopy
B．内镜检查Endoscopy
C．结肠镜检查Colonoscopy
D．肿瘤标志物概况Profile of tumour markers
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