Brain teaser: Lao Zhang has a serious stomach trouble, but he always goes to the dentist five days a week. Why?

Analysis: Lao Zhang has a serious stomach trouble, but he always goes to the dentist five days a week. According to the truth, Lao Zhang should go to the hospital to see his stomach trouble, but he went to the dentist instead. There is only one possibility, that is, Lao Zhang is a doctor and a dentist.

Extended data:

Brainstorming originated in ancient India. Brainstorming is a series of complete comic jokes published by the culture of the times on 1989 12.06, which changed from the comic question on the previous page to the unexpected answer after flipping through it. At that time, there was a social craze in Taiwan Province Province, and all the streets and alleys were asking each other brain teasers, which evolved into a pattern of cold jokes and was later introduced to Chinese mainland.

Brainstorming has a wide range of categories, including classics, puzzles, jokes, satire, mathematics, adults, English, all mankind, cold jokes and so on.

This word game has an obvious feature, the title is very common, but the answer is very irritating or funny, and sometimes it plays an indirect role in swearing. Once cracked, it's amazing. So brain teasers can also adjust the atmosphere of the party.