By a theorem of Matsusaka, every abelian variety $A$ is a quotient of a Jacobian.
Now just apply Matsusaka's theorem to $A^{\vee}$, and dualize.
By a theorem of Matsusaka, every abelian variety $A$ is a quotient of a Jacobian.
Now just apply Matsusaka's theorem to $A^{\vee}$, and dualize.