pupil xiao gao , from south east china , has not spoken a word in five days after a classmate who had allegedly bullied gave him the water , reports people 's daily online .
but medical experts are at a loss to explain his sudden inability to talk and say that the combination of water , perfume and dust - while nasty - should not have caused that type of damage .
gao , who is in year two at haidu number 8 middle school , is now awaiting further medical examination that