Title: Strasbourg.
Question: What kind of tourism attracts tourists yearly?

Title: Sino-Tibetan relations during the Ming dynasty.
Question: Who did not agree with van Praag and Shakabpa?

Title: Financial crisis of 2007%E2%80%9308.
Question: What is the financial innovation that bundles subprime mortgages?

Title: Iran.
Question:
According to Gary Lewis of the UN, what is the most pressing human security challenge in Iran?