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.
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Question: Context: Reactive oxygen species are involved in ovulation. The aim of this study was to examine gonadotropin regulation of antioxidant enzyme sulfiredoxin (Srx) and peroxiredoxin 2 (PRDX2) expressions and modification during the ovulatory process in rats. Administration of antioxidants in vivo reduced ovulation rate and cumulus expansion. LH treatment increased H(2)O(2) levels within 15 min, which, in turn, induced Srx gene expression in cultured preovulatory follicles. Treatment of preovulatory follicles with catalase suppressed the stimulatory effect of LH on Akt phosphorylation. LH- or H(2)O(2)-stimulated Srx mRNA levels were suppressed by inhibitors of antioxidant agents and MAPK kinase. An in vivo injection of equine chorionic gonadotropin-human chorionic gonadotropin (hCG) stimulated Srx mRNA within 1 h in granulosa but not thecal cells of preovulatory follicles. Srx protein levels were stimulated from 3 h post-hCG injection. Immunofluorescence analysis revealed that oocytes expressed the Srx protein. Furthermore, hCG treatment increased Srx expression in mural granulosa, theca and cumulus cells, but the Srx protein was not detected in corpora lutea. Gene expression of PRDX2, identified as an Srx-dependent modified enzyme, was stimulated by gonadotropins. In situ hybridization analysis demonstrated that PRDX2 mRNA was detected in oocytes and theca cells as well as granulosa cells of some antral and preovulatory follicles. High levels of PRDX2 mRNA were detected in corpora lutea. Total levels of PRDX2 protein were not changed by gonadotropins. However, levels of hyperoxidized PRDX2 increased within 2-3 h after the hCG injection. Taken together, gonadotropin stimulation of Srx expression and PRDX2 modification in the ovary suggest the existence of an antioxidant system to maintain H(2)O(2) production and elimination during the periovulatory period. 
 Question: What type of enzyme is peroxiredoxin 2 (PRDX2)?

Answer: antioxidant


Question: Context: When is a person considered an adult? That depends. Most teens become physically mature by the age of 16 or so. But they are not adults in a legal sense until they are older. For example, in the U.S., you must be 18 to vote. Once adulthood begins, it can be divided into three stages: (1) early, (2) middle, and (3) late adulthood. Early adulthood starts at age 18 or 21. It continues until the mid-30s. During early adulthood, people are at their physical peak. They are also usually in good health. The ability to have children is greatest during early adulthood, as well. This is the stage of life when most people complete their education. They are likely to begin a career or take a full-time job. Many people also marry and start a family during early adulthood. Middle adulthood begins in the mid-30s. It continues until the mid-60s. During middle adulthood, people start to show signs of aging. Their hair slowly turns gray. Their skin develops wrinkles. The risk of health problems also increases during middle adulthood. For example, heart disease, cancer, and diabetes become more common during this time. This is the stage of life when people are most likely to achieve career goals. Their children also grow up and may leave home during this stage. Late adulthood begins in the mid-60s. It continues until death. This is the stage of life when most people retire from work. They are also likely to reflect on their life. They may focus on their grandchildren. During late adulthood, people are not as physically able. For example, they usually have less muscle and slower reflexes. Their immune system also doesnt work as well as it used to. As a result, they have a harder time fighting diseases like the flu. The risk of developing diseases such as heart disease and cancer continues to rise. Arthritis is also common. In arthritis, joints wear out and become stiff and painful. As many as one in four late adults may develop Alzheimers disease. In this disease, brain changes cause mental abilities to decrease. This family picture shows females in each of the three stages of life. Which stage does each represent? Despite problems such as these, many people remain healthy and active into their 80s or even 90s. Do you want to be one of them? Then adopt a healthy lifestyle now and follow it for life. Doing so will increase your chances of staying healthy and active to an old age. Exercising the body and brain help prevent the physical and mental effects of aging. 
 Question: during this time, brain changes cause mental abilities to decrease.

Answer: late adulthood


Question: Context: Looking to stop a three-game losing streak, the Raiders welcomed Derek Carr back after missing one week due to injury to face the Los Angeles Chargers. However, things did not start well for Carr as he threw an interception on his first pass of the day and the Chargers took over at the Raider 30-yard line. the defense held the Chargers to a field goal attempt from 48 yards out which was no good. The Raiders took advantage and moved the ball down the field before Carr hit Michael Crabtree from 23 yards out to give the Raiders a 7-0 lead. Neither team could muster much offense until midway through the second quarter when the Chargers moved 82 yards and scored on a Melvin Gordon touchdown run from one yard out to tie the game. With, 1:34 remaining in the half, the Raiders moved into Charger territory and connected on a Giorgio Tavecchio 44-yard field goal as time expired to give the Raiders a 10-7 lead at the half. On their first possession of the second half, the Raiders moved deep into Charger territory, but managed no points as Carr was intercepted for the second time in the game. The teams exchanged punts and fumbles as the game moved into the fourth quarter. The Chargers finally managed some offense as Philip Rivers hit Melvin Gordon for a six-yard touchdown pass to give the Charger at 14-10 lead. On their ensuing possession, Cordarrelle Patterson took the ball on an end around and scampered 47 yards for a touchdown. Giorgio Tavecchio would, however, miss the ensuing point after to leave the Raider lead at two points, 16-14. After exchanging punts, the Chargers took over with 4:09 remaining in the game. Rivers hit Hunter Henry for a 23-yard pass play to move the ball into Raider territory. with less than two minutes remaining, the Chargers moved the ball to the Raider 10 yard line and lined up for the game-winning field goal with three second left in the game. The field goal was good and the Raiders suffered their fourth straight loss, falling to 2-4 on the season. The four losses through six gamed equaled the number of losses they suffered the entire season the prior year. The Raider defense again struggled, giving up 343 total yards while the offense struggled as well, managing only 274 yards. Carr's two interceptions proved costly in his return. After the game, the team said his poor play was not due to his injury. 
 Question: Which player threw the first TD pass to Crabtree?

Answer:
carr