instruction:
Generate a correct and concise answer for the question based on the words in the context.
question:
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 : What was the year Sinclair Scientific entered service?
answer:
1974


question:
Context : Mamochisane (fl. 1850s) was a Makololo Queen who ruled over many people, but especially the Lozi in Barotseland, today's Western Zambia, and was a wife of King Sipopa Lutangu. 
Question : What is Mamochisane's spouse's name?
answer:
Sipopa Lutangu


question:
Context : HR 3833 is an orange, type K1III, giant star in the constellation of Antlia that shines with a vis mag of 5.62 from a distance of 279 ly at RA 9h 37m 9.9s, Dec -32° 10' 43``. 
Question : Which was the constellation for HR 3833?
answer:

Antlia