Read this: Guinea-Bissau is a republic. In the past, the government had been highly centralized. Multi-party governance was not established until mid-1991. The president is the head of state and the prime minister is the head of government. Since 1974, no president has successfully served a full five-year term.

Who is the head of state?
What is the answer? (If it cannot be answered, return "unanswerable")
president