<prompt> Following are predispositions to Alzheimers disease except -Downs syndromeHead traumaSmokingLow education group  <response>: Risk factors for Alzheimers disease:- Old age, female sex, positive family history, head trauma, low educational status, depression, metabolic diabetes, hypercholesterolemia, elevated homocysteine, hypertension, CVA stroke, Heavy metals mercury, aluminium, genetic factors, downs syndrome. 