Did Van Gogh suffer from a mental disorder?
Rationale first then the answer.
Mental disorders can be characterized by psychotic episodes and delusions. Van Gogh suffered from psychotic episodes and delusions.. The answer is: yes.

Is a construction worker required to build a portfolio?
Rationale first then the answer.
Construction workers build physical constructs, usually buildings or structures. A portfolio is a collection of items of a similar type, including art, writing, or financial investments.. The answer is: no.

Is Norman Oklahoma named after a viking?
Rationale first then the answer.
The Normans invaded England in 1066 and were originally vikings from Scandinavia. Norman Oklahoma was first surveyed by land surveyor Abner Norman in the 1800s. 1066 is said to be the end of the Viking Era.. The answer is: no.