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.

Context: Davis sailed for San Francisco, California, around Cape Horn in 1852 Link Information:  By 1890, San Francisco's population approached 300,000 Answer: approached 300,000
How many people lived in San Francisco the year Davis embarked on his journey to the city?

Context: Born in Schrimm in the Province of Posen, Wilcke volunteered for military service in the Reichswehr of the Third Reich in 1934. Link Information: Posen was established as a province of the Kingdom of Prussia in 1848 Answer: 1848
When was the province where Wolf-Dietrich Wilcke was born established?

Context: In March 1996, a group of scientists at Lawrence Livermore National Laboratory reported that they had serendipitously produced the first identifiably metallic hydrogen Link Information: In March 1996, a group of scientists at Lawrence Livermore National Laboratory reported that they had serendipitously produced the first identifiably metallic hydrogen  Answer: C. Bruce Tarter

Who was the head of Lawrence Livermore National Laboratory when a group created a metallic hydrogen?