Answer:
3.) A professional runner using it for a heart condition
Step-by-step explanation:
Meldonium is known as an endocrine modulator and was manufactured to treat heart problems. Its active ingredient, mildronate, has protective function in the heart where it controls arrhythmias, decreases chances of myocardial infarction and prevents the formation of atherosclerotic plaques. Diabetes can also be treated with the drug, which led tennis player Maria Sharapova to use it for 10 years until she was caught in the doping test and suspended in 2016 as a result.