Based on the provided hint concerning the "missing data source explanation in readme.md" and the review of the content in the uploaded `readme.md` file, the following issue has been identified:

{
    "issue": "Lack of detailed data source explanation",
    "evidence": "These data will help to identify whether any person is having a coronavirus disease or not based on some pre-defined standard symptoms. These symptoms are based on guidelines given by the World Health Organization (WHO)who.int and the Ministry of Health and Family Welfare, India.",
    "description": "The README file mentions that the dataset's variables and their categorization are based on guidelines provided by WHO and the Ministry of Health and Family Welfare, India. However, there's a lack of a detailed explanation or reference to the specific documents, web pages, or data releases from these sources that were used to define the variables and their categorizations in the dataset. This absence makes it difficult for users of the dataset to verify the data's origin, understand its context completely, or assess its reliability and applicability for certain analyses. An explicit link or reference to the guidelines would enhance transparency and usability of the dataset."
},