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What are used as light source in Skin Reflectance Oximeter?

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What are used as light source in Skin Reflectance Oximeter?

(a) Photodiode

(b) Red and infrared LED’s

(c) Flashtube

(d) Arc Lamp

The question was asked in an interview.

This question is from Electromyograph (EMG) topic in portion Biomedical Recorders of Biomedical Instrumentation

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The correct option is (b) Red and infrared LED’s

To explain: A pair of red and infrared light emitting diodes are used for the light source, with peak emission wavelengths of 665 nm (red) and 935 nm (infrared). The reflected light from the skin at these two wavelengths is detected by a silicon diode.

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