A mother complains to the nurse that her 4-year-old son often lies. What’s the nurse’s best response

A. Let the child know that he’ll be punished for lying.
B. Ask him why he isn’t telling the truth.
C. It’s probably due to his vivid imagination and creativity.
D. Acknowledge him by saying, "That’s a pretend story. "

烟草中有五十余种有毒物质，其中致癌的有______、______、______、______、______等．