This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Conventional cytogenetics are difficult in solid tumors especially in case of carcinoma cervix -a) High mitotic rateb) Bacterial contamination of the specimenc) Good metaphase activityd)  Inadequate biopsy specimen 
Select and explain. 
A. c, B. d, C. bd, D. ac
C: bd
Answer: C: bd 
Explanation: None