Discussion
Faeces stains are identified from odour, presence of indigested matter, vegetable fibres and
Answer: A
Faeces stains are identified from the odour, the presence of undigested matter and vegetable fibres, and from stercobilin, the pigment that gives faeces its brown colour. It can be shown by spectroscopy or a chemical test.
Choline iodide crystals are the test for seminal fluid (Florence test), and rhombic crystals are not the faecal marker. Since only stercobilin belongs, 'All of the above' is wrong. A chemical test for urobilinogen and stercobilin, together with the smell and the fibres seen under a microscope, builds the identification, as no single feature on its own proves that a stain is faecal.
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