Last week I picked up _____ purse and handed it in to the headmaster. [ ]

A. a

B. an

C. the

D. /

56岁，男，意识错乱情绪不稳定1周，结合胸片和CT，最可能的诊断是()

A．肺癌

B．错构瘤

C．胸内甲状腺肿

D．韦格肉芽肿

E．胸腺瘤