If 80% of the diagnosis comes from history, what is the combined contribution of the remaining sources (exams and labs/x-ray)?

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Multiple Choice

If 80% of the diagnosis comes from history, what is the combined contribution of the remaining sources (exams and labs/x-ray)?

Explanation:
The key idea is that the total diagnostic information from all sources adds up to 100%. If history provides 80% of the diagnostic input, the remaining sources—physical examination and labs/imaging—must supply the rest. That means their combined contribution is 20%. The exact split between examination and tests isn’t specified by the question, only their total share. The other options would imply too little or too much given the 80% from history, so 20% is the correct combined contribution.

The key idea is that the total diagnostic information from all sources adds up to 100%. If history provides 80% of the diagnostic input, the remaining sources—physical examination and labs/imaging—must supply the rest. That means their combined contribution is 20%. The exact split between examination and tests isn’t specified by the question, only their total share. The other options would imply too little or too much given the 80% from history, so 20% is the correct combined contribution.

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