In the word polydipsia, which part is the prefix?

Which of the following is a cause of lung cancer?

a. Exposure to asbestos b. Passive smoking c. Smoking d. All of the above

Who is required to personally sign the original and all photocopies of reports submitted to the workers' compensation board?

a. attorney representing the patient b. both the patient and physician c. patient or legal representative d. physician or other health care provider