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.

Category: THERE'S A WEIGHT 
Clue: At the Kentucky Derby, the horses' equipment & these can weigh no less than 126 lbs. combined
the weight of the jockey

Category: NAMES YOU SHOULD KNOW 
Clue: Sharing her first name with Robin Hood's sweetie, this African-Amer. contralto earned the 1963 Pres. Medal of Freedom
marian anderson

Category: THE ANIMAL KINGDOM 
Clue: Of living birds, its eggs are the largest, weighing about 3 pounds on the average

an ostrich