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In December 1985, which terrorist organization hijacked Pan American Flight 73 at Karachi airport on its way from Bombay to New York?

  1. Al-Qaeda

  2. ISIS

  3. Abu Nidal

  4. Taliban

The correct answer is: Abu Nidal

We can deduce from the given question that the hijacking incident in question occurred in December 1985, at Karachi airport, on a flight from Bombay to New York. Based on this context, we can eliminate options B and D, as ISIS was not officially formed until 1999 and the Taliban did not establish control of Afghanistan until 1996. Al-Qaeda, while an active terrorist organization in the 1980s, did not have a history of hijacking airplanes at that time. Therefore, option A can also be ruled out. This leaves us with option C, Abu Nidal, as the correct answer. Abu Nidal was a Palestinian terrorist organization known for carrying out numerous international attacks in the 1980s, including the hijacking of Pan American Flight 73.