The main idea of the last paragraph is that ______ .
A. London still keeps buildings familiar to Dickens so as to commemorate him
B. many places in London offered inspirations to Dickens
C. a museum has been set up in honour of Dickens
D. for all the drastic changes, some places are still reminiscent of London in Dickens's time
Which of the following factors is NOT explictly mentioned in relation to side effects produced by prescription drugs？
A. Sex.
B. Age.
C. Emotional state.
D. Hormonal balance.
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