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:
| College or Campus Name | Location | District | Affiliation | Estd | Weblink |
| --- | --- | --- | --- | --- | --- |
| Anna University - Tiruchirappalli Campus | Tiruchirappalli | Tiruchirappalli district | Anna University | 1952.0 | http://www.annauniv.edu |
| Anna University - Panruti Campus | Panruti | Cuddalore district | Anna University | 1994.0 | http://www.aucev.edu.in/ |
| Anna University - Pattukkottai Campus | Rajamadam , Pattukkottai Taluk | Thanjavur | Anna University | 1966.0 | http://www.gcesalem.edu.in |
| Anna University - Thirukkuvalai Campus | Thirukkuvalai | Nagapattinam | Anna University | 1981.0 | http://www.annauniv.edu |
| Anna University - Ariyalur Campus | Ariyalur | Ariyalur | Anna University | 1942.0 | http://www.annauniv.edu |
Question:
Which district was established in 1942?
Answer:
Ariyalur