The Democratic Alliance for the Betterment of Hong Kong (DAB) yesterday ruled out co-operation with the Hong Kong Progressive Alliance at the May elections. DAB secretary-general Ma Lik made the comment on the eve of a meeting to finalise the party's candidate lists. This was despite recent remarks by Progressive Alliance leaders that a deal acceptable to both sides could be reached. One clash between the parties will come in the Hong Kong Island constituency, where Choy So-yuk of the Progressive Alliance will face DAB vice-chairman Gary Cheng Kai-nam. Mr Ma said the party had explored the co-operation option. 'But it became very clear that both Ms Choy and our own candidates are very keen on running for the seats,' he said. 'It would be difficult for us to run on a joint list because of our different orientation. 'The Progressive Alliance is more pro-business whereas we lean more towards the grassroots.' Mr Ma said Ms Choy had upset some party members by deciding to run, having said earlier she would not.