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What is used as a light source in ear oximeter?

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What is used as a light source in ear oximeter?

(a) Mercury-vapor lamp

(b) Sodium-vapor lamp

(c) Tungsten-iodine lamp

(d) Sulfur lamp

This question was addressed to me in an international level competition.

This interesting question is from Digital Stethoscope topic in chapter Biomedical Recorders of Biomedical Instrumentation

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Right choice is (c) Tungsten-iodine lamp

Easy explanation: The light source is a tungsten-iodine lamp that has a high output in the spectrum of interest. A lens system collimates the light beam and directs it through thin-film interference filters that provide wavelength selection.

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