Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Round | Pick | Player | Nationality | College |
| --- | --- | --- | --- | --- |
| 1.0 | 22.0 | Reggie Lewis | United States | Northeastern |
| 2.0 | 45.0 | Brad Lohaus | United States | Iowa |
| 4.0 | 70.0 | Tom Sheehey | United States | Virginia |
| 4.0 | 91.0 | Darryl Kennedy | United States | Oklahoma |
| 5.0 | 114.0 | David Butler | United States | California |
| 6.0 | 137.0 | Tim Naegeli | United States | Wisconsin–Stevens Point |
| 7.0 | 160.0 | Jerry Corcoran | United States | Northeastern |
Question:
What is the nationality of the round 4 draft selection who played college ball at oklahoma?
Answer:
United States