a) Taro Aso (prime minister)
b) Shoichi Nakagawa (ex-finance minister)
c) Tsuyoshi Kusanagi (aging drunken boy-band celeb)
Answer: None of the above - they are all arses? Nahh, Aso of course, he's the only one who shows his arse even when's he's sober.
(Oh, there's a couple of stories about Kusanagi floating about... have a look-see to your right.)