A Question Mark over someone/something:

If there's a question mark over someone, there's some doubt about their future or their ability to do something. If there's a question mark over something, there's some doubt about its quality or its authenticity.

There's been a question mark over the Prime Minister's health since he cancelled his trip to China.

 Even though there's a question mark over the painting's authenticity, it sold for over $10,000,000.

Persian:
شک، تردید