The following conditions can lead to the presence of small amounts of occult blood in the faeces:
However, iron supplements do not directly cause occult blood in faeces but can make the stool dark, which is often mistaken for blood.
Which of the following microbes is NOT involved in the preparation of household products?
A. \(\textit{Aspergillus niger}\)
B. \(\textit{Lactobacillus}\)
C. \(\textit{Trichoderma polysporum}\)
D. \(\textit{Saccharomyces cerevisiae}\)
E. \(\textit{Propionibacterium sharmanii}\)