You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.

Ex Input:
Paragraph- Sent 1: Conduction is the transfer of thermal energy.
Sent 2: It occurs between objects or substances that are touching.
Sent 3: Thermal conductors are materials that are good conductors of heat.
Sent 4: Thermal insulators are materials that are poor conductors of heat.
Sent 5: Both conductors and insulators have important uses.
Sent 6: Convection is the transfer of thermal energy.
Sent 7: This occurs as particles move within a fluid.
Sent 8: The fluid may be a liquid or a gas.
Sent 9: The particles within the fluid transfer energy by moving from warmer to cooler areas.
Sent 10: They move in loops.
Sent 11: These loops are called convection currents.
Sent 12: Radiation is the transfer of thermal energy by waves.
Sent 13: These waves can travel through empty space.
Sent 14: When the waves reach objects, the heat is transferred to the objects.
Sent 15: Radiation is how the Sun warms the Earths surface.
Question: What is it called when thermal energy is transferred between 2 objects that are touching (A) Convection (B) Conduction (C) Induction (D) Radiation.

Ex Output:
B.

Ex Input:
Paragraph- Sent 1: As for engravings, Durer's work was restricted to portraits and illustrations for his treatise.
Sent 2: The portraits include Cardinal-Elector Albert of Mainz; Frederick the Wise, elector of Saxony; the humanist scholar Willibald Pirckheimer; Philipp Melanchthon, and Erasmus of Rotterdam.
Sent 3: For those of the Cardinal, Melanchthon, and Durer's final major work, a drawn portrait of the Nuremberg patrician Ulrich Starck, Durer depicted the sitters in profile, perhaps reflecting a more mathematical approach.
Sent 4: Despite complaining of his lack of a formal classical education, Durer was greatly interested in intellectual matters and learned much from his boyhood friend Willibald Pirckheimer, whom he no doubt consulted on the content of many of his images.
Sent 5: He also derived great satisfaction from his friendships and correspondence with Erasmus and other scholars.
Sent 6: Durer succeeded in producing two books during his lifetime.
Sent 7: "The Four Books on Measurement" were published at Nuremberg in 1525 and was the first book for adults on mathematics in German, as well as being cited later by Galileo and Kepler.
Sent 8: The other, a work on city fortifications, was published in 1527.
Sent 9: "The Four Books on Human Proportion" were published posthumously, shortly after his death in 1528.
Question: Whom did Durer both draw a porter of and consult with? (A) The Cardinal (B) Ulrich Starck (C) Frederick the Wise (D) Philipp Melanchthon (E) Melanchthon (F) Willibald Pirckheimer (G) Erasmus.

Ex Output:
F, G.

Ex Input:
Paragraph- Sent 1: The driver of the Facel Vega car, Michel Gallimard, who was Camus's publisher and close friend, also died in the accident.
Sent 2: In August 2011, the Milan newspaper Corriere della Sera reported a theory that the writer had been the victim of a Soviet plot, but Camus's biographer, Olivier Todd, did not consider it credible.
Sent 3: Camus was buried in the Lourmarin Cemetery, Lourmarin, Vaucluse, France.
Sent 4: He was the second-youngest recipient, at the age of 44, of the Nobel Prize in Literature, after Rudyard Kipling, at the age of 42.
Sent 5: He was survived by his wife and twin son and daughter, Jean and Catherine, who hold the copyrights to his work.
Sent 6: Two of Camus's works were published posthumously.
Sent 7: The first, entitled A Happy Death (1970), featured a character named Patrice Mersault, comparable to The Stranger's Meursault.
Sent 8: There is scholarly debate as to the relationship between the two books.
Sent 9: The second was an unfinished novel, The First Man (1995), which Camus was writing before he died.
Sent 10: The novel was an autobiographical work about his childhood in Algeria.
Question: Which two Camus books is there a scholarly debate about? (A) "The First Man" and "A Happy Death" (B) There is no debate about two of his books (C) There's a debate about one of his books - A Happy Death - and Kipling's book (D) A Happy Death and The First Man (E) The First Man and an untitled unfinished book.

Ex Output:
A, D.