夜盲症和脚气病是因为体内分别缺乏( )
A:维生素C、维生素D
B:维生素A、维生素C
C:维生素B1、维生素A
D:维生素A、维生素B1
─ Do you drink much coffee as before?
─ No, at all. My sleeping problem is getting worse.