In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.

Question: How many Nobel Prizes in Physics were awarded before it was given to Leo Esaki? Passage:A tunnel diode or Esaki diode is a type of semiconductor diode that has negative resistance due to the quantum mechanical effect called tunneling. It was invented in August 1957 by Leo Esaki, Yuriko Kurose, and Takashi Suzuki when they were working at Tokyo Tsushin Kogyo, now known as Sony. In 1973, Esaki received the Nobel Prize in Physics, jointly with Brian Josephson, for discovering the electron tunneling effect used in these diodes. Robert Noyce independently devised the idea of a tunnel diode while working for William Shockley, but was discouraged from pursuing it. Tunnel diodes were first manufactured by Sony in 1957, followed by General Electric and other companies from about 1960, and are still made in low volume today.

In 1973, Esaki received the Nobel Prize in Physics, jointly with Brian Josephson, for discovering the electron tunneling effect used in these diodes

Question: Between the bass player and the founding drummer of Kajagoogoo, who has more siblings? Passage:Islands is the second album by the British pop band Kajagoogoo, released on 21 May 1984 on the EMI label. This was the band's first album without lead vocalist Limahl, who had been fired by the band in mid-1983 and went on to pursue a solo career. Bass player Nick Beggs, already the group's main backing singer, took over lead vocal duties, and also wrote the lyrics. The album was co-produced by the band themselves, now a four-piece group, along with Colin Thurston, who had also produced their debut, White Feathers. It is the final album to-date to feature founding drummer Jez Strode. The album also marked the first time Nick Beggs used the Chapman Stick on a recording.

Bass player Nick Beggs, already the group's main backing singer, took over lead vocal duties, and also wrote the lyrics

Question: What kind of aircraft were leased? Passage:In addition to withdrawing from the prestigious long-haul routes to New York and Los Angeles after only 18 months, other specific measures the airline took at the time to ensure its survival included dropping all scheduled flights to Belfast, Copenhagen, Gibraltar, Ibiza, Malaga, Palma de Mallorca and Tunis, indefinitely suspending scheduled services on the GlasgowSouthampton route as well as cutting the number of frequencies on the GatwickGlasgow and GatwickEdinburgh routes from six to four daily round trips. Two surplus aircraft were leased out to Air Malta and Austrian Airlines respectively for the duration of the 1975 summer timetable period. Another aircraft was stationed at West Berlin's Tegel Airport during the month of July of that year to fulfill a short-term charter contract to carry Turkish migrant workers to and from Istanbul on behalf of a local tour operator. BCal also decided to increase its 707 freighter fleet from one to four aircraft and to acquire a five-seater Piper Aztec to serve the rapidly growing executive charter market. These changes left BCal with 25 operational aircraft for the 1975 summer season. To reduce operating costs further, the airline decided to contract out its scheduled operations between Gatwick and Le Touquet to BIA. The reason for replacing BCal's One-Eleven 200 jet aircraft on this route with that airline's Herald turboprops at the beginning of the 1975 summer timetable period was the high price of jet fuel, which had made BCal's own jet aircraft operations uneconomic.
Two surplus aircraft were leased out to Air Malta and Austrian Airlines respectively for the duration of the 1975 summer timetable period