Correct Option: B

Supachai Panitchpakdi is the Secretary-General of the UN Conference on Trade and Development (UNCTAD). Prior to this, he was the Director-General of the World Trade Organization from September 1, 2002 to September 1, 2005. He was succeeded by Pascal Lamy. In September 1999 he was elected to become Director-General of the World Trade Organization (WTO), sharing the post with competitor Mike Moore when a decision could not be reached. Taking the second half of the six-year term, he entered office on September 1, 2002.In March 2005 he was appointed to become the Secretary-General of the UN Conference on Trade and Development (UNCTAD) following his term at the WTO, a post he took up in late 2005.
Note : The current Director-General of WTO is Roberto Azevedo of Brazil, since 1 September 2013. Headquarters of WTO: Geneva, Switzerland.