In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

[Q]: Who ruled Bithynia before Bas?, Context: The Bithynians were a Thracian people living in northwest Anatolia. After Alexander's conquests the region of Bithynia came under the rule of the native king Bas, who defeated Calas, a general of Alexander the Great, and maintained the independence of Bithynia. His son, Zipoetes I of Bithynia maintained this autonomy against Lysimachus and Seleucus I, and assumed the title of king (basileus) in 297 BCE. His son and successor, Nicomedes I, founded Nicomedia, which soon rose to great prosperity, and during his long reign (c. 278 c. 255 BCE), as well as those of his successors, the kingdom of Bithynia held a considerable place among the minor monarchies of Anatolia. Nicomedes also invited the Celtic Galatians into Anatolia as mercenaries, and they later turned on his son Prusias I, who defeated them in battle. Their last king, Nicomedes IV, was unable to maintain himself against Mithridates VI of Pontus, and, after being restored to his throne by the Roman Senate, he bequeathed his kingdom by will to the Roman republic (74 BCE).
[A]: Calas

[Q]: Why could there be reasonable doubt about the validity of what was stated that she said?, Context: In May 2007, The Daily Telegraph, citing unnamed sources, reported that the Queen was "exasperated and frustrated" by the policies of the British Prime Minister, Tony Blair, that she was concerned the British Armed Forces were overstretched in Iraq and Afghanistan, and that she had raised concerns over rural and countryside issues with Blair. She was, however, said to admire Blair's efforts to achieve peace in Northern Ireland. On 20 March 2008, at the Church of Ireland St Patrick's Cathedral, Armagh, the Queen attended the first Maundy service held outside England and Wales. At the invitation of the Irish President, Mary McAleese, the Queen made the first state visit to the Republic of Ireland by a British monarch in May 2011.
[A]: unnamed sources

[Q]: What is being overlooked due to the Gates' grantees?, Context: The foundation has donated billions of dollars to help sufferers of AIDS, tuberculosis and malaria, protecting millions of children from death at the hands of preventable diseases. However, a 2007 investigation by The Los Angeles Times claimed there are three major unintended consequences with the foundation's allocation of aid. First, sub-Saharan Africa already suffered from a shortage of primary doctors before the arrival of the Gates Foundation, but "by pouring most contributions into the fight against such high-profile killers as AIDS, Gates grantees have increased the demand for specially trained, higher-paid clinicians, diverting staff from basic care" in sub-Saharan Africa. This "brain drain" adds to the existing doctor shortage and pulls away additional trained staff from children and those suffering from other common killers. Second, "the focus on a few diseases has shortchanged basic needs such as nutrition and transportation". Third, "Gates-funded vaccination programs have instructed caregivers to ignore even discourage patients from discussing ailments that the vaccinations cannot prevent".
[A]:
basic care