You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Montevideo

Context:
Hospital Vilardebó is the only psychiatric hospital in Montevideo. Named after the physician and naturalist Teodoro Vilardebó Matuliche, it opened 21 May 1880. The hospital was originally one of the best of Latin America and in 1915 grew to 1,500 inpatients. Today the hospital is very deteriorated, with broken walls and floors, lack of medicines, beds, and rooms for the personnel. It has an emergency service, outpatient, clinic and inpatient rooms and employs approximately 610 staff, psychologists, psychiatrists, social workers, administrators, guards, among others. The average patient age is 30 years; more than half of the patients arrive by court order; 42% suffer from schizophrenia, 18% from depression and mania, and there are also a high percentage of drug addicted patients.

Question:
When did the Hospital Vilardebo open?

21 May 1880