Question: Where did Humphry Sibthorp (Botanist)'s father study?

Knowledge 1: Humphry Sibthorp (botanist)
Humphry Waldo Sibthorp (1713–1797) was a British botanist.He was a younger son of John Sibthorpe, MP for Lincoln and Mary Browne, daughter of Humphrey Browne of Lincoln.After the death of Johann Jacob Dillenius (1684–1747), he became the Sherardian Professor of Botany at the University of Oxford from 1747 to 1783.He is known for having taught one course for 37 years.He began the catalogue of the plants of the botanical garden of the university, "Catalogus Plantarum Horti Botanici Oxoniensis".The genus "Sibthorpia", in the plantain family of plants is named after him. [SEP] Knowledge 2: John Sibthorpe
John Sibthorpe (1669–1718), of St. Mark's, Lincoln, was an English politician.He was the son of Gervase Sibthorpe of St Mark's and Judith Riggall, daughter of Mark Riggall and widow of Benjamin Marshall, and was educated at Christ Church, Oxford.He was a Member (MP) of the Parliament of Great Britain for Lincoln from 1713 to 1715, but made very little impact in the House.He was buried on 27 April 1718 at St. Mark's church.He had married in 1703, Mary, the daughter and coheiress of Humphrey Browne of Lincoln and had 4 sons and a daughter.His widow acquired Canwick Hall, near Lincoln, which his son Coningsby, MP for Lincoln for many years and High Sheriff of Lincolnshire in 1733, would go on to inherit in 1727.A younger son, Humphry Sonthorp, was a noted botanist who held a chair in botany at Oxford University.
Knowledge 1: Humphry Sibthorp (botanist)
Humphry Waldo Sibthorp (1713–1797) was a British botanist.He was a younger son of John Sibthorpe, MP for Lincoln and Mary Browne, daughter of Humphrey Browne of Lincoln.After the death of Johann Jacob Dillenius (1684–1747), he became the Sherardian Professor of Botany at the University of Oxford from 1747 to 1783.He is known for having taught one course for 37 years.He began the catalogue of the plants of the botanical garden of the university, "Catalogus Plantarum Horti Botanici Oxoniensis".The genus "Sibthorpia", in the plantain family of plants is named after him. [SEP] Knowledge 2: Humphrey Sibthorp (1744–1815)
Humphrey Sibthorp (3 October 1744 – 25 April 1815) was a British Tory politician who sat in the House of Commons in two periods between 1777 and 1806.Sibthorp was the eldest surviving son of the botanist Humphry Sibthorp and his first wife Sarah Waldo, daughter of Isaac Waldo of Streatham, Surrey.He was educated at Harrow School in 1755 and Westminster School in 1756.In 1758 he matriculated at Corpus Christi, Oxford on 24 May and was awarded BA in 1762 and MA in 1766.He entered Lincoln's Inn in 1766 and was called to the bar in 1770.At the 1774 general election, Sibthorp stood for Parliament at Lincoln and Newark, and was bottom of the poll in both constituencies.He was elected as a Member of Parliament (MP) for Boston at a by-election on 3 May 1777, after the death of Charles Amcotts MP.He was re-elected in 1780, but was defeated at the 1784 general election.Sibthorp was elected as a Member of Parliament (MP) for Lincoln at a by-election on 9 April 1800, after the death of George Rawdon MP.He was re-elected in 1802, but declined to stand 1806 general election, because of ill-health.
Knowledge 1: John Sibthorpe
John Sibthorpe (1669–1718), of St. Mark's, Lincoln, was an English politician.He was the son of Gervase Sibthorpe of St Mark's and Judith Riggall, daughter of Mark Riggall and widow of Benjamin Marshall, and was educated at Christ Church, Oxford.He was a Member (MP) of the Parliament of Great Britain for Lincoln from 1713 to 1715, but made very little impact in the House.He was buried on 27 April 1718 at St. Mark's church.He had married in 1703, Mary, the daughter and coheiress of Humphrey Browne of Lincoln and had 4 sons and a daughter.His widow acquired Canwick Hall, near Lincoln, which his son Coningsby, MP for Lincoln for many years and High Sheriff of Lincolnshire in 1733, would go on to inherit in 1727.A younger son, Humphry Sonthorp, was a noted botanist who held a chair in botany at Oxford University. [SEP] Knowledge 2: Humphrey Sibthorp (1744–1815)
Humphrey Sibthorp (3 October 1744 – 25 April 1815) was a British Tory politician who sat in the House of Commons in two periods between 1777 and 1806.Sibthorp was the eldest surviving son of the botanist Humphry Sibthorp and his first wife Sarah Waldo, daughter of Isaac Waldo of Streatham, Surrey.He was educated at Harrow School in 1755 and Westminster School in 1756.In 1758 he matriculated at Corpus Christi, Oxford on 24 May and was awarded BA in 1762 and MA in 1766.He entered Lincoln's Inn in 1766 and was called to the bar in 1770.At the 1774 general election, Sibthorp stood for Parliament at Lincoln and Newark, and was bottom of the poll in both constituencies.He was elected as a Member of Parliament (MP) for Boston at a by-election on 3 May 1777, after the death of Charles Amcotts MP.He was re-elected in 1780, but was defeated at the 1784 general election.Sibthorp was elected as a Member of Parliament (MP) for Lincoln at a by-election on 9 April 1800, after the death of George Rawdon MP.He was re-elected in 1802, but declined to stand 1806 general election, because of ill-health.

Answer: Christ Church