Answer
8 mA
Work Step by Step
For resistors in series, the equivalent resistance is their sum.
The current in the entire circuit, and in the patient, is the source voltage divided by the equivalent resistance that it “sees”: $I=\frac{\epsilon}{R_{eq}}$.
$$I=\frac{240V}{10^4\Omega+10^4\Omega +10^4\Omega }=8\times10^{-3}A$$
