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In this question, we are given a list of discoveries and a list of scientists. We need to match each discovery with the correct scientist.
List I:
A. Circulation of blood - William Harvey
B. Stethoscope - Rene Laennec
C. X-ray - Wilhelm C. Roentgen
D. Electro-cardiogram (ECG) - Willem Einthoven
List II:
1. William Harvey
2. Wilhelm C. Roentgen
3. Willem Einthoven
4. Rene Laennec
We can see that the correct matches are:
A. Circulation of blood - William Harvey
B. Stethoscope - Rene Laennec
C. X-ray - Wilhelm C. Roentgen
D. Electro-cardiogram (ECG) - Willem Einthoven
Therefore, the correct answer is option 1: A - 1, B - 4, C - 2, D - 3.
Each option has a different combination of scientist and discovery. Option 2 does not have the correct match for the circulation of blood, which is William Harvey. Option 3 does not have the correct match for the stethoscope, which is Rene Laennec. Option