Teacher:In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
Teacher: Now, understand the problem? Solve this instance: Context: He first became known for an Academy Award-nominated documentary short, Solo, in which he climbed El Capitan solo. Link Information: After his successful solo ascent of the Leaning Tower, Royal Robbins turned his attention to the Yvon Chouinard-T.M. Herbert Muir Wall route, completing the first solo ascent of El Capitan during a 10-day push in 1968. The first solo ascents of El Capitan's four classic "siege" routes were accomplished by Thomas Bauman on The Nose in 1969; Peter Hann on the Salathé Wall in 1972; Robert Kayen on the Layton Kor-Steve Roper West Buttress route in 1982; and Beverly Johnson on the Cooper-Baldwin-Denny Dihedral Wall route in 1978. Other noteworthy early solo ascents were the solo first ascent of Cosmos by Jim Dunn in 1972, Zodiac by Charlie Porter in 1972; Tangerine Trip by David Mittel in 1985; and The Pacific Ocean Wall by Robert Slater in 1982. These ascents were long 7- to 14-day ordeals that required the solo climber lead each pitch, and then rappel, clean the climbing gear, reascend the lead rope, and haul equipment, food, and water using a second haul rope. Answer: 10
Student:
How many people climbed El Capitan solo before Mike Hoover?