TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: SINGING ACTORS 
Clue: In 2001 this Oscar winner sang "Angelina", a romantic tribute to his fifth wife, on his album "Private Radio"

SOLUTION: billy bob thornton

PROBLEM: Category: SEAS THE MOMENT 
Clue: This sea sits between Oman & India

SOLUTION: the arabian sea

PROBLEM: Category: 15-LETTER WORDS 
Clue: This type of rumor lacks a basis in fact

SOLUTION:
unsubstantiated