Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Input: Consider Input: Context: 1836 Komarov, provisional designation 1971 OT, is a main-belt asteroid discovered on 26 July 1971 by Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnyj.
Question: Who discovered 1836 Komarov?

Output: nikolai chernykh

Input: Consider Input: Context: Copper of Kargaly origin was distributed during Bronze Age over a vast territory within the steppe and forest-steppe of Eastern Europe.
Question: What is the product of Kargaly?

Output: copper

Input: Consider Input: Context: The authors describe a family with six patients with muscular dystrophy with a variable course. One is a compound heterozygote for CAPN3 mutations (calpainopathy) and the others have a single CAPN3 mutation. Linkage analysis and sequencing revealed a XK gene mutation (McLeod syndrome). This illustrates the variable phenotype of XK mutations and suggests the possibility that CAPN3 heterozygotes may have their condition caused by nonallelic mutations in other unrelated genes.
Question: Mutation of which gene is associated with McLeod syndrome?
Output: xk