Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_29778616_1 (intro_date VARCHAR, interface VARCHAR)
### Question:
What is the intro date for the interface that equals pci?
### Answer:
SELECT intro_date FROM table_29778616_1 WHERE interface = "PCI"