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Based on the information provided, it is not explicitly stated why aspirin was the sole treatment recommended. However, aspirin is a well-known and widely used medication due to its anti-inflammatory, pain relief, and fever-reducing properties. It is also an antiplatelet drug, which helps prevent blood clots from forming [1].

In the context of treating aches and pains, aspirin is often recommended as a first-line treatment due to its effectiveness and availability. It is also generally considered safe for most individuals when used as directed [2].

Moreover, aspirin is an inexpensive medication, which may be a factor in its recommendation as a sole treatment. Its patent has expired, making it widely available and affordable [3].

In summary, while the specific reason for recommending aspirin as the sole treatment is not provided, it is a commonly used medication for pain relief, has antiplatelet properties, and is widely available and affordable.

Sources:
[1] Mayo Clinic. Aspirin - Overview. <https://www.mayoclinic.org/drugs-supplements-aspirin/art-20365802>.
[2] US National Library of Medicine. Aspirin: MedlinePlus Drug Information. <https://medlineplus.gov/druginfo/meds/a682437.html>.
[3] DrugPatentWatch.com. Aspirin (Acetylsalicylic Acid) Drug Patent Information. <https://www.drugpatentwatch.com/drugs/aspirin>.