Irene, if you go to Oyster C, remember to try the following:
(1) Oyster
(2) 龍蝦仔
(3) 海膽
(4) 加拿大肉蟹 + 黑醋汁 (highly recommend if you're a crab lover)
(5) Garlic Bread
(6) Pasta
I have tried cod fish and duck breast as well...not bad but not as good as the above.