<prompt> Beri-Beri is caused by -ThiamineFolic acidRiboflavinNiacin  <response>: - beri beri is due to the deficiency of thiamine. - it has 3 main forms. Dry form characterised by nerve involvement. Wet firm characterised by hea involvement and infantile beri beri. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:618 p 