Generate a correct and concise answer for the question based on the words in the context.

[EX Q]: Context : Balamani Amma died on 29 September 2004 after having suffered from Alzheimer's disease for nearly five years. 
Question : What medical condition did Balamani Amma have at the end of his life?
[EX A]: Alzheimer's disease

[EX Q]: Context : The Sinclair Scientific calculator was a 12-function, pocket-sized scientific calculator introduced in 1974, dramatically undercutting in price other calculators available at the time. 
Question : In which year was the service entry date for Sinclair Scientific?
[EX A]: 1974

[EX Q]: Context : The Bravia Chaimite is an armored vehicle with all wheel drive axles built by the Portuguese company Bravia and used by the Portuguese Army in the Portuguese colonial wars in Angola, Mozambique and Portuguese Guinea, from 1967 to 1974 when it ended. 
Question : What was the year Bravia Chaimite entered service?
[EX A]:
1967