Diarrhoea refers to the loss of what type of feces?

Diarrhoea is characterized by the passage of abnormally loose or watery stools. This condition often indicates an underlying issue affecting the digestive system, such as infections, food intolerances, or inflammatory bowel conditions. The defining feature of diarrhoea is the high water content in the feces, which differs significantly from solid, hard, or even soft stools in terms of consistency and fluidity.

In contrast, solid feces are typically well-formed and represent normal bowel movements, while hard feces indicate constipation. Soft stools, although they may not be as watery as those in diarrhoea, still do not fully capture the excess fluid characteristic that defines diarrhoea. Thus, the emphasis on "watery" clearly identifies the nature of the stools lost during this condition, making it the correct answer.