Concept:
Certain fungi contaminate food commodities and produce toxic secondary metabolites known as mycotoxins. These toxins pose serious health risks and are considered major food safety hazards.
Step 1: Understanding the organism.
\textit{Aspergillus flavus} is a fungus commonly found in improperly stored food products such as groundnuts (peanuts), maize, and other oilseeds.
Step 2: Toxin produced.
This fungus produces
aflatoxins, which are highly toxic and carcinogenic compounds.
Step 3: Effects of aflatoxin.
- Liver damage (hepatotoxicity)
- Carcinogenic (especially liver cancer)
- Suppression of immune system
Step 4: Eliminating other options.
- Solanine: Found in potatoes
- Oxalate: Found in leafy vegetables
- Phytate: Common antinutrient in cereals and legumes
Step 5: Conclusion.
Thus, the toxic constituent associated with \textit{Aspergillus flavus} in groundnuts is aflatoxin.