4. Which of the followin it is the tool used to con bat sativa the features of given ab ove? A) Cotton rolls B) Salive ab sorber C)R libber dam D) Atropi te a matrix

The correct answer is C) Ribber dam. A ribber dam is a tool commonly used to collect saliva samples for diagnostic purposes. It is a small device that is placed between the teeth and cheek to collect saliva from the oral cavity. The collected saliva can then be used for various tests and analyses. Cotton rolls, saliva absorbers, and atropine are not typically used for collecting saliva samples.