<prompt> Goitre is prevalent at higher altitude, is an example of -Direct associationIndirect associationCausal associationTemporal association  <response>: Endemic goiter is generally found in high altitude showing thereby an association between altitude and endemic goiter. We know that endemic goiter is not due to altitude but due to environmental deficiency of iodine. Ref: 25th edition, Parks Textbook of Preventive and Social Medicine, Page no. 96 