Correct?

A grandmother lived in her grandson’s house. The man loved his grandmother very much. However, she had some strange habits, and so the man thought she needed medical help. Perhaps, he thought, she needed to spend the rest of her life in a special hospital.
“I’d like you to look over my grandmother,” he told a doctor. “Then let me know if you think she needs special care,”
“All right,” the doctor said. “Send her to me next Tuesday.” Tuesday came and the old woman went to see the doctor. She sat in front of the doctor and he asked her lots of questions. She answered them all, and the doctor was surprised. “There’s nothing wrong with the woman,” he thought. “I don’t understand why her grandson sends her to me. Perhaps he’s the one who needs special care.”
He then asked her the last question. “Why do you think,” he asked her, “your grandson wants you to have special care?”
“I like hamburgers,” she said.
The doctor laughed. “There’s nothing wrong with that. I like hamburgers, too!”
“You do?” the old woman said. “I’m so glad. Then you must come to my house and have a hamburger with me. I have boxes and boxes of them in my bedroom”

I wonder if my answers are correct.

1. What is the grandmother's problem?. My answer is (d).
a. Her grandson is crazy.
b. Her grandson only gives her hamburger.
c. She keeps hamburgers in her bedroom.
d. She doesn't have problem.

2. At the end of story. the doctor probably thinks the grandmother .
My answer is (b)
a. needs his help.
b. has a crazy son.
c. eats good food.
d. should not eat hamburgers.