Final answer:
Charles Darnay reveals his true identity as Charles St. Evrémonde to Dr. Manette on the morning of the wedding in 'A Tale of Two Cities,' causing Dr. Manette psychological distress due to his past trauma with the St. Evrémonde family.
Step-by-step explanation:
The student's question pertains to the text from Charles Dickens's novel A Tale of Two Cities, although the passages provided do not relate directly to the question asked. The question, "What did Charles Darnay tell Dr. Manette the morning of the wedding? How did it affect the doctor?" refers to a significant moment in the story where Charles Darnay reveals his true identity to Dr. Manette prior to marrying Lucie, Dr. Manette's daughter. Darnay reveals that he is actually Charles St. Evrémonde, the nephew of the Marquis St. Evrémonde, who represents the oppressive aristocracy that Dr. Manette despises.
Upon hearing this revelation, Dr. Manette is severely affected as he had been previously imprisoned by the St. Evrémonde family, and this causes a relapse into his post-traumatic stress. Dickens illustrates the emotional and psychological upheaval Dr. Manette experiences as a result of Darnay's disclosure, and the impact it has on him leading up to the wedding.