<prompt> Which of the following test is done for detecting vaginal cells from the accused in a case of rape?Lugols iodinePhenolphthaleinToluidine blueMethylene blue  <response>: Lugols iodine test detects the presence of vaginal epithelial cells. It is done on washings of the glans penis or from moist blotting paper of accused which is exposed to Lugols iodine solution or iodine vapours. A positive test showing brown colour is due to the presence of glycogen in vaginal epithelial cells of the victim. Results can be elicited upto 4 days. 