Which of these Triple Crown winners was NOT also 2-Year-Old Champion the previous year?

Which of these Triple Crown winners was NOT also 2-Year-Old Champion the previous year?

Which of these Triple Crown winners was NOT also 2-Year-Old Champion the previous year? [691 votes total]
Affirmed (115)	17%
American Pharoah (187)	27%
Assault (173)	25%
Citation (54)	8%
Seattle Slew (78)	11%
Whirlaway (84)	12%