Definition: In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.
Input: Question: What was the age difference between Marie-Felix Blanc's parents? Passage:Marie-Felix Blanc was born on 22 December 1859 in Paris to French businessman Francois Blanc and his second wife, Marie Charlotte Hensel. Her father was the founder of the Societe des bains de mer de Monaco and operated multiple casinos, including the Casino de Monte-Carlo in Monaco and the Bad Homburg vor der Hohe Casino in Germany. Her godfather, Count Antoine Bertora, was rumored to be her biological father. She had an older sister, Louise; an older brother, Edmond; and two older half-brothers from her father's first marriage to Madeleine-Victoire Huguelin, Camille and Charles. Her older sister later married Prince Constantine Wincenty Maria Radziwi. Her older brother later served as the mayor of La Celle-Saint-Cloud and her older half brother, Camille, served as mayor of Beausoleil. When she was 18 years old, Blanc's father died, leaving her a vast inheritance.
Links: a. Francois Blanc b. Edmond Blanc c. Camille Blanc d. Monaco
Output:
a