context: Prof. Dr. Gerrit A. Siwabessy () was the Minister of the National Atomic Energy Agency on August 27, 1964 and the Minister of Health of the Republic of Indonesia in the years 1966 to 1978 during the reign of President Soekarno to President Soeharto.
question: How long did Prof. Dr. Gerrit A. Siwabessy became Minister of Health of the Republic of Indonesia?
answers.text: 1966 to 1978