Which is the correct MLA format for a parenthetical citation this medical journal Henry John. Studies in impact of cola on student achievement Medicine 101 6 (2013) 89-105. Print.?

The correct MLA format for a parenthetical citation of this medical journal article is:

(John 89-105).

Here's why:

* Author's Last Name: You only need the author's last name, "John," in the parenthetical citation.

* Page Numbers: The page range where the information you're citing is located is always included, separated by a hyphen.

* No Period: There's no period at the end of a parenthetical citation in MLA format.

Important Note: While you've provided the source information, it's important to remember that it is crucial to cite the specific information you are using from the journal article, not just the whole article. For example, if you are citing a specific finding, you might write:

* "A recent study found that students who consumed cola regularly had lower test scores (John 95)."