Which of the following are necessary causes (select all that apply)?

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Infection by Mycobacterium tuberculosis is, by definition, necessary
to cause TB and HPV infection is necessary to cause cervical cancer but neither is a
sufficient cause as not all those infected will develop disease.The others are all very
important component causes of the diseases (there is a very strong relationship
between the factor and the disease), but disease can also develop in their absence.

Which of the Following Are Necessary Causes (Select All That