Europe's largest bank HSBC says it is 'reviewing its options' over a sale of its stake in Vietnamese insurance firm Bao Viet Holdings.Currently HSBC holds an 18% stake in the high profile company but press reports have suggested it is being considered for disposal.HSBC says: "no decision has been made yet".The bank is currently facing pressure in the US over alleged money laundering transactions for drug gangs in Mexico and terrorist affiliates in the Middle East.BS