Teacher: In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Passage: The group was occasionally diverted from strategic missions to carry out air support and interdiction missions. It supported Operation Overlord, the invasion of Normandy by attacking transportation targets, including bridges, along with airfields and strong points in France. On D Day, the squadron and the rest of the 446th Group led the first heavy bomber mission of the day. The 446th aided ground forces at Caen and Saint-Lo during July by hitting bridges, gun batteries, and enemy troops. During Operation Market Garden, the attempt to seize a bridgehead across the Rhine in the Netherlands, the 704th dropped supplies to allied troops near Nijmegen. It struck lines of communications during the Battle of the Bulge. During Operation Varsity in March 1945, it supplied ground and airborne troops near Wesel. The squadron flew its last combat mission on 25 April 1945 against Salzburg, Austria. The group had flown 273 missions and had lost 58 aircraft during the war,
. Link Information: Operation Market Garden was a failed World War II military operation fought in the Netherlands from 17 to 25 September 1944. Question: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin?
Solution: from 17 to 25 September 1944
Reason: The passage describes the 704th's actions during Operation Market Garden, and the answer specifies when the operation happened.

Now, solve this instance: Passage: The Andres Bonifacio-class frigates were passed to the Philippine Navy with fewer weapons aboard than they had had during their U.S. Navy and U.S. Coast guard careers and with old surface search radars installed. The Philippine Navy addressed these shortfalls through modernization programs. In Philippine service, Diego Silang retained her South Vietnamese armament, consisting of a single Mark 12 5"/38 caliber (127-mm) gun, a dual-purpose weapon capable of anti-surface and anti-air fire, mounted in a Mark 30 Mod 0 enclosed base ring with a range of up to yards; two twin Mark 1 Bofors 40mm anti-aircraft gun mounts, four Mk. 4 single 20-millimeter Oerlikon anti-aircraft gun mounts, four M2 Browning .50-caliber (12.7-millimeter) general-purpose machine guns, and two 81-mm mortars. However, in 1979 Hatch and Kirk, Inc., added a helicopter deck aft which could accommodate a Philippine Navy MBB Bo 105C helicopter for utility, scouting, and maritime patrol purposes, although the ship had no capability to refuel or otherwise support visiting helicopters. The Sperry SPS-53 surface search and navigation radar also was installed, replacing the AN/SPS-23 radar, although the ship retained both its AN/SPS-29D air search radar and its Mark 26 Mod 1 Fire Control Radar System. The Philippine Navy made plans to equip Diego Silang and her sister ships with new radar systems and long-range BGM-84 Harpoon anti-ship cruise missiles, but this upgrade did not materialize due to the worsening political and economic crisis in the Philippines in the mid-1980s.
Link Information: none Question: How many of the 105C helicopter did the Philippine Navy operate?
Student:
Answer: none