Answer to Question 1
Correct Answer: 20
Rationale: It is estimated that viruses are associated with about 15 to 20 of all human cancers. Examples include herpes simplex types 1 and 2, Epstein-Barr, human papillomavirus (HPV), cytomegalovirus, and human T-lymphotrophic viruses.
Global Rationale: It is estimated that viruses are associated with about 15 to 20 of all human cancers. Examples include herpes simplex types 1 and 2, Epstein-Barr, human papillomavirus (HPV), cytomegalovirus, and human T-lymphotrophic viruses.
Answer to Question 2
Correct Answer: 3
Rationale 1: Biological causes, such as some viruses, are causes of cancer.
Rationale 2: Chemical causes, such as tobacco, alcohol, and asbestos, are causes of cancer.
Rationale 3: Structural causes are not included in the etiology of cancer.
Rationale 4: Physical causes, such as UV light, are causes of cancer.
Global Rationale: The etiology of cancer may be chemical (such as tobacco, alcohol, and asbestos), physical (such as UV light), or biologic (such as viruses). Structural causes are not included in the etiology of cancer.