What is the origin of the idiom "pick one's brain" and when to use it?

The origin of the idiom "pick one's brain" likely draws on the metaphorical idea of the human brain as a valuable resource containing knowledge and insights. The word "pick" in this context suggests the act of selectively extracting or gathering information, similar to picking individual items from a collection. Over the years, the phrase has become a widely recognized phrase that is used to describe the act of seeking advice, information, or expertise from someone by engaging in a conversation or discussion.