Which of the following is an example of a genetic disorder?

Parkinson's disease is indeed classified as a genetic disorder, although its causes can be complex and multifactorial. Genetic disorders arise from anomalies in genes or chromosomes that can affect the structure and function of proteins, ultimately impacting how cells and tissues behave.

In the case of Parkinson's disease, there are known genetic variations that can increase the risk of developing the condition, indicating that both genetic and environmental factors contribute to its manifestation. Researchers have identified specific mutations in genes such as SNCA, LRRK2, and PARK7, which are linked to familial forms of the disease. This genetic component distinguishes Parkinson's from infectious agents or environmental disease, which are the triggers for the other options.

While flu, common cold, and malaria are influenced by external factors such as viruses and parasites, they do not stem from genetic mutations. These conditions are examples of infectious diseases rather than genetic disorders, as they result from pathogens invading the body rather than inherited genetic mutations affecting the individual's biology. This key distinction clarifies why Parkinson's disease is a fitting example of a genetic disorder.